{ "model": { "rank": 6528, "code": "thing-q211737", "model_id": "vr.tr.sodium-sulfate", "name": "sodium sulfate", "purpose": "Enable an AI agent to identify sodium sulfate, assess its hydration and quality, and determine whether a particular material is suitable for a proposed use or transformation.", "family": "Thing Registry", "category": "Physical world and living systems", "status": "research-draft", "kind": "thing", "plane": "PHY", "domain": "PHY.MAT", "industry": "", "version": "", "url": "/models/thing/q211737/", "tier": 2, "score": 60, "payload": { "layer": "wikidata", "aliases": [], "aliasCount": 0, "merged": 0, "knownIn": 60, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": null, "source": { "dataset": "wikidata", "item": "Q211737", "url": "https://www.wikidata.org/wiki/Q211737", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-07T15:05:54Z", "providers": [ "Codex", "Grok" ], "missingProviders": [], "pass": 2, "cost": { "grok": { "usd": 0.0047515, "turns": 1, "seconds": 69.6, "error": null }, "codex": { "seconds": 88.9, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.3\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a07c66-2a8f-7960-b9ba-450320910eca\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: sodium sulfate\nRegistry id: vr.tr.sodium-sulfate\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entry: (no" } } }, "metaModel": { "id": "THING-Q211737", "registryId": "vr.tr.sodium-sulfate", "name": "sodium sulfate", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.MAT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q211737/", "model": { "registry_id": "vr.tr.sodium-sulfate", "name": "sodium sulfate", "purpose": "Enable an AI agent to identify sodium sulfate, assess its hydration and quality, and determine whether a particular material is suitable for a proposed use or transformation.", "definition": "Sodium sulfate is the inorganic salt Na2SO4 (CAS 7757-82-6), occurring as the anhydrous mineral thenardite and the decahydrate mirabilite (Glauber's salt), produced industrially as a by-product of HCl and rayon manufacture and used as a kraft-pulp makeup chemical, a detergent filler, and a glass-batch sulfate source.", "scope_statement": "This model owns the identity, composition, hydration, physical condition and use-relevant qualifications of sodium sulfate under vr.tr.sodium-sulfate, treating hydrate forms as material states within this entry and linking to neighbouring models for mixtures, processes and products.", "in_scope": [ "Identification of Na2SO4 and evidence distinguishing it from other sodium salts or sulfate salts", "Anhydrous, hydrated, mixed-phase and unresolved hydration states", "Sodium sulfate content, water content and impurities with explicit reporting bases", "Solid condition and sodium sulfate behaviour during dissolution, crystallisation and storage", "Evidence supporting acceptance, reconditioning or rejection for a specified use" ], "out_of_scope": [ "Sodium sulfite, sodium hydrogen sulfate and other chemically distinct salts", "Complete compositions and properties of brines, detergents or other mixtures containing sodium sulfate", "Mining deposits, geological formations and extraction operations", "Design and operation of manufacturing, drying or crystallisation equipment", "Clinical prescribing, food formulation and finished-product approval", "Building deterioration and thermal-storage system performance beyond the sodium sulfate material contribution" ], "distinguishing_features": [ "Require evidence for both sodium and sulfate consistent with Na2SO4; a white appearance or sodium identification alone cannot establish identity.", "Use an anion-specific analysis capable of separating sulfate from sulfite and chloride rather than treating similarly named or coloured salts as equivalent.", "Distinguish sodium hydrogen sulfate through composition and acidity evidence; pH alone is insufficient to establish Na2SO4 identity.", "Determine crystal phase and water content to distinguish anhydrous sodium sulfate from its decahydrate; both forms belong within this proposed scope. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/sodium_sulfate)", "For mixed solutions, distinguish a measured sulfate concentration from an attributable sodium sulfate quantity; coexisting sodium and sulfate do not uniquely identify the salt originally dissolved." ], "characteristics": [ { "name": "Identity confidence", "kind": "state", "unit_or_values": "label-only | analytically supported | conflicting | unresolved", "why_it_matters": "Prevents a supplier name or appearance from being treated as verified chemical identity." }, { "name": "Hydration and phase assignment", "kind": "category", "unit_or_values": "anhydrous | decahydrate | other identified hydrate | mixed phases | unresolved", "why_it_matters": "Determines how mass, water content and phase-dependent behaviour should be interpreted." }, { "name": "Sodium sulfate assay", "kind": "measurement", "unit_or_values": "mass % as Na2SO4, explicitly as-received or on a defined dry basis", "why_it_matters": "Supports comparable purity assessments and correct quantities despite differing water contents." }, { "name": "Water content and assignment", "kind": "measurement", "unit_or_values": "mass % water with method; crystal water, surface moisture and unassigned water distinguished where supported", "why_it_matters": "A total water result alone cannot establish a unique hydrate or usable drying condition." }, { "name": "Impurity profile", "kind": "measurement", "unit_or_values": "mg/kg or mass % by named impurity, including detection limits and reporting basis", "why_it_matters": "Chloride, other salts, insoluble matter or trace contaminants may determine suitability independently of the main assay." }, { "name": "Particle and handling condition", "kind": "state", "unit_or_values": "powder | granular | crystalline | caked | wet; particle-size distribution in µm where relevant", "why_it_matters": "Supports decisions about dispensing, dissolution and whether conditioning is necessary." }, { "name": "Condition history", "kind": "relation", "unit_or_values": "linked temperature, humidity, wetting, drying and container-exposure observations", "why_it_matters": "Connects observed hydration or caking to conditions that may have changed the material." }, { "name": "Dissolved concentration", "kind": "measurement", "unit_or_values": "g Na2SO4/kg solution or mol/kg water, with temperature and attribution basis", "why_it_matters": "Avoids confusing solution concentration, solid hydrate mass and salt-equivalent quantity." }, { "name": "Use-specific qualification", "kind": "relation", "unit_or_values": "linked intended use, specification revision, evidence and acceptance decision", "why_it_matters": "Chemical identity alone does not establish fitness for drying, formulation or another application." } ], "affordances": [ "Verify or quarantine a labelled sodium sulfate material using identity, phase and assay evidence.", "Calculate a required sodium sulfate quantity using the measured assay and a declared hydration basis.", "Assess whether a lot meets a specified reagent, drying or industrial formulation requirement.", "Plan dissolution or crystallisation using concentration, temperature and applicable phase data.", "Select an evidenced drying or reconditioning procedure and require checks before reuse.", "Set storage and retesting conditions appropriate to the required hydration and handling state." ] }, "sources": [ { "id": "pubchem-7757-82-6", "title": "Sodium sulfate (Compound)", "url": "https://pubchem.ncbi.nlm.nih.gov/compound/Sodium-sulfate", "what_it_supports": "Formula Na2SO4, CAS 7757-82-6, InChIKey, hydrates, melting point, density, solubility, uses, and GHS/hazard notes from a curated NIH compound record.", "url_status": "live" }, { "id": "wikipedia-sodium-sulfate", "title": "Sodium sulfate", "url": "https://en.wikipedia.org/wiki/Sodium_sulfate", "what_it_supports": "Mineral names thenardite and mirabilite, Glauber's salt, industrial production routes, kraft-pulp/detergent/glass uses, hydrate phases, and distinction from sodium sulfite and sodium bisulfate.", "url_status": "live" }, { "id": "echa-reach-sodium-sulfate", "title": "Sodium sulphate - Substance Infocard", "url": "https://echa.europa.eu/substance-information/-/substanceinfo/100.028.928", "what_it_supports": "EC 231-820-9, REACH registration, and EU regulatory identity for sodium sulphate.", "url_status": "unverified" }, { "id": "efsa-e514", "title": "Re-evaluation of sodium sulphate (E 514) as a food additive", "url": "https://www.efsa.europa.eu/en/efsajournal/pub/5397", "what_it_supports": "EU food-additive identity E 514, specifications context, and authorised use as an acidity regulator/carrier rather than a nutrient salt.", "url_status": "blocked" } ], "structure": { "bundles": [ { "id": "salt-identity-and-boundaries", "name": "Salt identity and boundaries", "description": "Establish whether the material is sodium sulfate and what portion of a sample this identity describes.", "rationale": "Similar salt names and nonspecific observations can produce a plausible but incorrect identification.", "layers": [ { "id": "chemical-discrimination", "name": "Chemical discrimination", "description": "Resolve the sodium sulfate identity against neighbouring salts.", "findings": [ { "id": "supported-na2so4-identity", "name": "Supported Na2SO4 identity", "description": "Record the analytical and documentary evidence for sodium sulfate, including contradictory results.", "questions": [ { "text": "What evidence establishes sodium and sulfate in a composition consistent with Na2SO4?", "kind": "definition", "id": "supported-na2so4-identity-q01" }, { "text": "Which analyses distinguish this material from sodium sulfite, sodium hydrogen sulfate and sodium chloride?", "kind": "measurement", "id": "supported-na2so4-identity-q02" }, { "text": "Does the identification describe the whole material or only one component?", "kind": "boundary", "id": "supported-na2so4-identity-q03" } ] } ] }, { "id": "form-and-entry-mapping", "name": "Form and entry mapping", "description": "Connect labels and hydrate descriptions to the single registry entry.", "findings": [ { "id": "label-to-material-mapping", "name": "Label-to-material mapping", "description": "Preserve the supplier's identity and form claims while distinguishing them from verified observations.", "questions": [ { "text": "Does the label identify anhydrous sodium sulfate, a hydrate or an unspecified form?", "kind": "provenance", "id": "label-to-material-mapping-q01" }, { "text": "Are the stated name, formula and substance identifier consistent with the claimed hydration state?", "kind": "definition", "id": "label-to-material-mapping-q02" }, { "text": "Does an existing catalogue model already own this concept and require a link instead of another publication?", "kind": "boundary", "id": "label-to-material-mapping-q03" } ] } ] } ] }, { "id": "hydration-and-phase-state", "name": "Hydration and phase state", "description": "Represent the water-bearing and crystalline state of sodium sulfate under observed conditions.", "rationale": "Hydration affects salt-equivalent mass and behaviour; it cannot safely be inferred from the substance name.", "layers": [ { "id": "phase-identification", "name": "Phase identification", "description": "Separate crystal-phase assignments from bulk water measurements.", "findings": [ { "id": "resolved-hydrate-composition", "name": "Resolved hydrate composition", "description": "Record evidence for anhydrous, hydrated or mixed phases without forcing an uncertain sample into a single form.", "questions": [ { "text": "Which crystalline phases are supported by diffraction, spectroscopy or another validated method?", "kind": "measurement", "id": "resolved-hydrate-composition-q01" }, { "text": "How much measured water is assigned to crystal water rather than surface moisture or retained solution?", "kind": "measurement", "id": "resolved-hydrate-composition-q02" }, { "text": "Could sample preparation have changed the hydration state before measurement?", "kind": "provenance", "id": "resolved-hydrate-composition-q03" } ] } ] }, { "id": "phase-change-conditions", "name": "Phase-change conditions", "description": "Connect phase observations to environmental and treatment history.", "findings": [ { "id": "hydration-state-persistence", "name": "Hydration-state persistence", "description": "Record the conditions under which the assigned phase remains supported and when reassessment is needed.", "questions": [ { "text": "What temperature, humidity and contact with liquid water preceded the current observation?", "kind": "provenance", "id": "hydration-state-persistence-q01" }, { "text": "Which applicable phase data constrain the expected state at the proposed storage or process conditions?", "kind": "boundary", "id": "hydration-state-persistence-q02" }, { "text": "What exposure or treatment requires a new phase or water-content measurement?", "kind": "action", "id": "hydration-state-persistence-q03" } ] } ] } ] }, { "id": "assay-and-salt-equivalent", "name": "Assay and salt equivalent", "description": "Determine how much sodium sulfate is present and whether associated material is acceptable.", "rationale": "Hydrate water and impurities make gross sample mass an unreliable substitute for Na2SO4 quantity.", "layers": [ { "id": "quantity-basis", "name": "Quantity basis", "description": "Make assays and requested quantities comparable across hydration states.", "findings": [ { "id": "traceable-salt-equivalent", "name": "Traceable salt equivalent", "description": "Express usable sodium sulfate content with its assay method, denominator and uncertainty.", "questions": [ { "text": "Is the assay expressed as Na2SO4 on an as-received basis, a defined dry basis or a named hydrate basis?", "kind": "definition", "id": "traceable-salt-equivalent-q01" }, { "text": "What measured assay and uncertainty apply to the material being dispensed?", "kind": "measurement", "id": "traceable-salt-equivalent-q02" }, { "text": "What sample mass supplies the requested Na2SO4 amount after applying the supported assay basis?", "kind": "action", "id": "traceable-salt-equivalent-q03" } ] } ] }, { "id": "impurity-selectivity", "name": "Impurity selectivity", "description": "Distinguish sodium sulfate from contaminants that alter acceptance or bias its measurement.", "findings": [ { "id": "use-relevant-contaminants", "name": "Use-relevant contaminants", "description": "Record named impurity results and whether the assay distinguishes sodium sulfate from other sulfate-bearing material.", "questions": [ { "text": "Which chloride, other-ion, insoluble-matter or trace-contaminant limits apply to the intended use?", "kind": "boundary", "id": "use-relevant-contaminants-q01" }, { "text": "Could other sulfate salts inflate a sulfate-based sodium sulfate assay?", "kind": "measurement", "id": "use-relevant-contaminants-q02" }, { "text": "Which lot-specific results and detection limits demonstrate compliance with those limits?", "kind": "provenance", "id": "use-relevant-contaminants-q03" } ] } ] } ] }, { "id": "dissolution-and-crystallisation", "name": "Dissolution and crystallisation", "description": "Support decisions involving transfer between solid sodium sulfate and aqueous solution.", "rationale": "Concentration, temperature and solid-phase identity must be considered together when assessing dissolution or precipitation.", "layers": [ { "id": "solution-accounting", "name": "Solution accounting", "description": "Track sodium sulfate equivalents in solution without implying identifiable dissolved salt molecules.", "findings": [ { "id": "defined-solution-concentration", "name": "Defined solution concentration", "description": "Record concentration, water contribution and attribution evidence for dissolved sodium sulfate.", "questions": [ { "text": "What is the concentration, its denominator and the measurement temperature?", "kind": "measurement", "id": "defined-solution-concentration-q01" }, { "text": "Has water introduced by a hydrated solid been included in the solution mass balance?", "kind": "measurement", "id": "defined-solution-concentration-q02" }, { "text": "In a mixed brine, what evidence supports attributing an amount to sodium sulfate rather than reporting sodium and sulfate separately?", "kind": "boundary", "id": "defined-solution-concentration-q03" } ] } ] }, { "id": "solid-liquid-transition", "name": "Solid-liquid transition", "description": "Assess dissolution and crystallisation against data applicable to the actual composition.", "findings": [ { "id": "phase-specific-saturation", "name": "Phase-specific saturation", "description": "Connect saturation assessments and recovered crystals to the relevant sodium sulfate phase.", "questions": [ { "text": "Which solubility data apply to the temperature, solvent composition and candidate solid phase?", "kind": "provenance", "id": "phase-specific-saturation-q01" }, { "text": "Is the material fully dissolved, in equilibrium with solids or in an unresolved transient state?", "kind": "measurement", "id": "phase-specific-saturation-q02" }, { "text": "What phase and mother-liquor checks are required before recovered crystals can be assigned a composition?", "kind": "action", "id": "phase-specific-saturation-q03" } ] } ] } ] }, { "id": "fitness-and-material-conditioning", "name": "Fitness and material conditioning", "description": "Translate sodium sulfate condition into a justified use, treatment or rejection decision.", "rationale": "The required hydration, purity and particle condition depend on the proposed role, so identity alone cannot authorize use.", "layers": [ { "id": "role-specific-acceptance", "name": "Role-specific acceptance", "description": "Relate the lot's measured properties to a declared application.", "findings": [ { "id": "qualified-material-role", "name": "Qualified material role", "description": "Record whether the material meets the requirements of its proposed role and where qualification remains incomplete.", "questions": [ { "text": "Is the proposed role a sulfate feedstock, formulation ingredient, drying agent or another explicitly defined use?", "kind": "definition", "id": "qualified-material-role-q01" }, { "text": "Which hydration, impurity and particle-condition requirements determine acceptance for that role?", "kind": "boundary", "id": "qualified-material-role-q02" }, { "text": "If proposed for drying, what evidence establishes adequate water-removal performance in the actual solvent and conditions?", "kind": "measurement", "id": "qualified-material-role-q03" } ] } ] }, { "id": "storage-and-reconditioning", "name": "Storage and reconditioning", "description": "Control changes that could invalidate the required sodium sulfate condition.", "findings": [ { "id": "condition-preserving-actions", "name": "Condition-preserving actions", "description": "Link storage, drying or reuse decisions to the target hydration state and contamination history.", "questions": [ { "text": "What container and environmental conditions are supported for maintaining the required hydration and flow condition?", "kind": "action", "id": "condition-preserving-actions-q01" }, { "text": "Has prior use introduced solvents or contaminants that prevent treating this material as fresh sodium sulfate?", "kind": "provenance", "id": "condition-preserving-actions-q02" }, { "text": "What validated conditioning procedure and post-treatment checks are required before release or reuse?", "kind": "action", "id": "condition-preserving-actions-q03" } ] } ] } ] }, { "id": "evidence-and-external-alignment", "name": "Evidence and external alignment", "description": "What the world already says about this thing, gathered so the model can be checked against it.", "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.", "layers": [ { "id": "reported-evidence", "name": "Reported evidence", "description": "Findings from the breadth pass, kept separate from the structural claims.", "findings": [ { "id": "evidence-kinds", "name": "Kinds and varieties", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "anhydrous sodium sulfate (thenardite)", "sodium sulfate decahydrate (mirabilite, Glauber's salt)", "sodium sulfate heptahydrate", "natural mineral thenardite", "natural mineral mirabilite", "technical/industrial grade (detergent, glass, kraft pulp)", "pharmaceutical/analytical grade (USP/Ph. Eur. anhydrous or decahydrate)", "food-grade additive (E 514)" ], "questions": [ { "id": "evidence-kinds-q01", "text": "Which of these kinds and varieties hold for the sense of sodium sulfate this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-identifiers", "name": "Identifiers and schemes", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "scheme": "CAS Registry Number", "value_or_pattern": "7757-82-6 (anhydrous); 7727-73-3 (decahydrate)", "note": "Anhydrous and decahydrate have distinct CAS numbers; heptahydrate is 15225-75-4." }, { "scheme": "EC / EINECS", "value_or_pattern": "231-820-9", "note": "ECHA substance identity for sodium sulphate." }, { "scheme": "PubChem CID", "value_or_pattern": "24436", "note": "Compound record for Na2SO4." }, { "scheme": "InChIKey", "value_or_pattern": "PMZURENOXWZQFD-UHFFFAOYSA-L", "note": "Canonical key for the anhydrous salt." }, { "scheme": "Wikidata", "value_or_pattern": "Q211737", "note": "Item for sodium sulfate; mineral thenardite is Q407806, mirabilite Q422201." }, { "scheme": "UNII", "value_or_pattern": "36KCS0R750 (anhydrous); 0YPR65R21J (decahydrate)", "note": "FDA Unique Ingredient Identifiers used in drug listings." }, { "scheme": "EU food additive", "value_or_pattern": "E 514", "note": "Sodium sulphates (E 514(i) sodium sulphate, E 514(ii) sodium hydrogen sulphate in some listings)." }, { "scheme": "HS / CN code", "value_or_pattern": "2833.11 (disodium sulphate)", "note": "Harmonized System heading for disodium sulfate in trade statistics." } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of sodium sulfate this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-standards-and-regulation", "name": "Standards and regulation", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "USP / NF monograph Sodium Sulfate (United States Pharmacopeial Convention) for pharmaceutical anhydrous and decahydrate grades", "Ph. Eur. Sodium sulfate, anhydrous and Sodium sulfate decahydrate (European Directorate for the Quality of Medicines)", "FCC / Codex specifications for food-grade sodium sulfate (Food Chemicals Codex; JECFA/Codex Alimentarius for E 514)", "Regulation (EC) No 1333/2008 and Commission Regulation (EU) No 231/2012 specifications for E 514 (European Commission / EFSA re-evaluation)", "REACH registration under EC 231-820-9 (ECHA); not classified as hazardous under CLP for the pure salt in the typical infocard listing", "OSHA / NIOSH workplace exposure practice treats it as a nuisance/particulate dust rather than a listed toxic air contaminant (US DOL / CDC NIOSH)", "ISTA / ASTM soil and concrete sulfate tests (e.g. ASTM C1580, related EN 206 sulfate-class rules) govern sulfate attack on concrete when sodium sulfate is the exposure salt, not a product spec for the chemical itself" ], "questions": [ { "id": "evidence-standards-and-regulation-q01", "text": "Which of these standards and regulation hold for the sense of sodium sulfate this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-real-world-use", "name": "Real-world use", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Kraft pulp mill makeup chemical: supplies sodium and sulfate ions to the recovery cycle (salt cake)", "Powder detergent filler and processing aid, historically a major consumer of natural and by-product salt cake", "Glass batch sulfate: refining/fining agent and source of SO3 in soda-lime glass", "Textile processing: Glauber's salt as a levelling/exhaustion salt in cotton dyeing with reactive and vat dyes", "Laboratory drying of organic extracts (anhydrous Na2SO4) where a milder, cheaper desiccant than MgSO4 is acceptable", "Osmotic laxative in oral bowel-prep and veterinary products (decahydrate / pharmaceutical grade)", "Thermal energy storage: Glauber's salt phase-change material around 32 °C, limited by incongruent melting and phase segregation", "Construction/geotech hazard rather than a product: mirabilite/thenardite cycling causes salt weathering of stone and sulfate attack of concrete" ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of sodium sulfate this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-measurements", "name": "Typical measurements", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "quantity": "assay (Na2SO4, dry basis)", "typical_range": "99.0-99.9 (technical ~98-99.5; reagent/Ph.Eur. ≥99.0)", "unit": "% w/w" }, { "quantity": "water of crystallization / loss on drying", "typical_range": "anhydrous <0.5; decahydrate ~55-56 (theoretical 55.9)", "unit": "% w/w H2O" }, { "quantity": "melting point (anhydrous)", "typical_range": "884", "unit": "°C" }, { "quantity": "decahydrate incongruent melting / transition", "typical_range": "32.4 (Na2SO4·10H2O → anhydrous + solution)", "unit": "°C" }, { "quantity": "density (anhydrous, 20 °C)", "typical_range": "2.66-2.70", "unit": "g·cm−3" }, { "quantity": "aqueous solubility (anhydrous, 20 °C)", "typical_range": "about 19-20 (rises sharply toward 32 °C then falls for the anhydrous form)", "unit": "g/100 g water" }, { "quantity": "chloride and iron as impurities (industrial/Ph.Eur.)", "typical_range": "Cl typically ≤0.05-0.2; Fe often ≤10-50", "unit": "% w/w Cl; mg·kg−1 Fe" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of sodium sulfate this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-failure-modes-and-hazards", "name": "Failure modes and hazards", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Hydration cycling (thenardite ↔ mirabilite) generates crystallization pressure that spalls stone, brick, and concrete (salt weathering).", "Sulfate attack of Portland cement: ettringite/gypsum formation and expansion in soils or groundwater rich in sodium sulfate.", "Incongruent melting of Glauber's salt in heat-storage packs: anhydrous crystals settle, capacity is lost, packs leak or stratify.", "Caking and hydrate uptake on storage of the anhydrous salt in humid air; the decahydrate effloresces in dry air.", "Dust irritation of eyes and respiratory tract; large oral doses cause osmotic diarrhea and electrolyte disturbance (intended as a laxative, hazardous in overdose or in infants).", "Not a strong oxidizer and not classified like sodium chlorate; the main chemical confusion hazard is mis-identifying it as sodium sulfite (reductant) or sodium bisulfate (acid salt) in a process charge." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of sodium sulfate this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-regional-variation", "name": "Regional variation", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "English 'salt cake' and German 'Glaubersalz' remain trade names; mineral names thenardite/mirabilite dominate geology, while detergent and pulp industries still say salt cake.", "Natural production is concentrated in evaporite lakes (e.g. Spain, Canada, US Great Basin, China, former USSR); Western Europe historically relied more on Mannheim/HCl and rayon by-product sulfate.", "EU food law lists E 514; US food use is as a miscellaneous/processing salt rather than a prominent labelled additive.", "Spelling: sulphate (IUPAC/UK/EU regulatory texts) vs sulfate (US, IUPAC alternative, CAS indexing)." ], "questions": [ { "id": "evidence-regional-variation-q01", "text": "Which of these regional variation hold for the sense of sodium sulfate this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-neighbours", "name": "Neighbouring kinds and how to tell them apart", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "name": "sodium sulfite (Na2SO3)", "difference": "Sulfite is a reductant (deoxygenates, bleaches, iodometric titre); sulfate is redox-inert under those tests. IR/Raman: sulfite vs sulfate stretching; wet test: acidified sulfite evolves SO2, sulfate does not." }, { "name": "sodium bisulfate / sodium hydrogen sulfate (NaHSO4)", "difference": "Acid salt: aqueous pH strongly acidic (~1 for concentrated solutions) vs near-neutral Na2SO4; melts/decomposes as an acid flux, not a high-melting neutral sulfate." }, { "name": "sodium bisulfite / metabisulfite (NaHSO3 / Na2S2O5)", "difference": "Preservative/reductant with SO2 odour on acidification; sulfate gives no SO2 and no iodine consumption." }, { "name": "magnesium sulfate (Epsom salt, MgSO4·7H2O)", "difference": "Both are bitter saline hydrates used as laxatives; flame test or AAS/ICP: Na yellow vs Mg; Epsom heptahydrate is the common pharmacy hydrate, Glauber's salt is the decahydrate of sodium." }, { "name": "sodium carbonate (soda ash) and sodium chloride", "difference": "Carbonate effervesces with acid and is alkaline; chloride gives AgCl with AgNO3 that is insoluble in nitric acid. Sulfate gives a BaSO4 precipitate insoluble in acid." }, { "name": "calcium sulfate (gypsum/anhydrite)", "difference": "Much lower solubility; does not supply soluble Na+; XRD and solubility separate thenardite/mirabilite from gypsum in evaporites and concrete." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of sodium sulfate this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Does an existing Vercy world model already cover sodium sulfate, and what registry boundary has been established for its hydrate forms?", "Which authoritative phase-equilibrium and kinetic sources should govern hydrate assignments under the intended temperature, humidity and solution conditions?", "Which analytical methods can reliably distinguish crystal water, surface moisture and retained mother liquor in the expected samples?", "Which application-specific specifications and impurity limits must be supported, and how should conflicting grade claims be resolved?", "What evidence is available for drying performance, reconditioning limits and reuse acceptance under the actual solvents and contamination histories?" ], "statistics": { "bundles": 6, "layers": 11, "findings": 18, "questions": 38 } }, "draft": { "generator": "vr.draft.v3", "status": "draft-generated", "researched": false, "archetype": "chemical substance or material", "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.", "facetsInferred": true, "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.", "purpose": "Give an agent a durable, checkable way to recognise a sodium sulfate, record what state it is in, and decide what may be done with it.", "whatItIs": "Enable an AI agent to identify sodium sulfate, assess its hydration and quality, and determine whether a particular material is suitable for a proposed use or transformation.", "characteristics": { "substance": "material", "origin": "natural", "agency": "inert", "mobility": "varies" }, "whatYouCanDoWithIt": [ "observed and measured", "consumed or used up" ], "distinguishingFeatures": [ "Described in 60 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is." ], "openQuestionsForResearch": [ "Which of the bundles below does a real task actually need, and which are ceremony?", "What does this thing have that the facets do not capture at all?", "Which neighbouring kind is most often confused with a sodium sulfate, and on what evidence are they told apart?" ], "whatItIsMadeOf": "matter you can touch", "physicalCharacter": [ "Mobility varies between examples.", "Does nothing on its own; everything it does, something else did to it.", "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing." ], "whatCanBeDoneWithIt": [ "observe it, measure it, record its state", "use it up, and then need more of it" ], "howItIsRecognised": [ "Not recognisable by sight in any reliable way. Appearance varies with grade, form and additives; identification is by label, by documentation, or by assay." ], "relatedModels": [], "standing": "Described in 60 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one sodium sulfate from another, and a sodium sulfate from things that resemble it.", "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.", "layers": [ { "id": "naming-and-identifiers", "name": "Names and identifiers", "description": "The names this thing goes by and the identifiers that survive translation and time.", "findings": [ { "id": "preferred-name-and-aliases", "name": "Preferred name, aliases and local names", "description": "Which name to use, which names mean the same thing, and which merely sound similar.", "questions": [ { "id": "preferred-name-and-aliases-q01", "text": "What identifies and describes the name of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "preferred-name-and-aliases-q02", "text": "Who or what asserted this about the name of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "preferred-name-and-aliases-q03", "text": "What may an agent decide or do once the name of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "stable-identifiers", "name": "Stable identifiers and external keys", "description": "Identifiers that keep pointing at this kind of thing across systems and languages.", "questions": [ { "id": "stable-identifiers-q01", "text": "What identifies and describes an identifier for a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stable-identifiers-q02", "text": "Who or what asserted this about an identifier for a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stable-identifiers-q03", "text": "What may an agent decide or do once an identifier for a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "classification-and-granularity", "name": "Classification and granularity", "description": "Where a sodium sulfate sits among kinds, and how finely a task needs to cut it.", "findings": [ { "id": "kind-and-parents", "name": "Kind, parents and neighbouring kinds", "description": "The classes this thing belongs to and the ones it is next to.", "questions": [ { "id": "kind-and-parents-q01", "text": "What identifies and describes the kind of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "kind-and-parents-q02", "text": "Who or what asserted this about the kind of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "kind-and-parents-q03", "text": "What may an agent decide or do once the kind of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] }, { "id": "distinguishing-features", "name": "Distinguishing features", "description": "What separates a sodium sulfate from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "distinguishing-features-q02", "text": "Who or what asserted this about what distinguishes a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "distinguishing-features-q03", "text": "What may an agent decide or do once what distinguishes a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "form-and-composition", "name": "Form, composition and condition", "description": "What a sodium sulfate is made of, what shape and size it takes, and what state it is in.", "rationale": "A physical thing can be measured, and a model that cannot record its measurements cannot support any decision that depends on them.", "layers": [ { "id": "form-and-dimensions", "name": "Form and dimensions", "description": "Shape, size, mass and the ranges these take across examples.", "findings": [ { "id": "measurable-dimensions", "name": "Measurable dimensions and their units", "description": "The quantities worth recording and the units they are recorded in.", "questions": [ { "id": "measurable-dimensions-q01", "text": "What identifies and describes the dimensions of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "measurable-dimensions-q02", "text": "Who or what asserted this about the dimensions of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "measurable-dimensions-q03", "text": "What may an agent decide or do once the dimensions of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "material-and-composition", "name": "Material and composition", "description": "Materials, parts and how they are put together.", "findings": [ { "id": "parts-and-materials", "name": "Parts and materials", "description": "What a sodium sulfate is built from and which parts are replaceable.", "questions": [ { "id": "parts-and-materials-q01", "text": "What identifies and describes the composition of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "parts-and-materials-q02", "text": "Who or what asserted this about the composition of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "parts-and-materials-q03", "text": "What may an agent decide or do once the composition of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "condition-and-integrity", "name": "Condition and integrity", "description": "Wear, damage, health and the difference between working and broken.", "findings": [ { "id": "condition-assessment", "name": "Condition, damage and health", "description": "How the condition of a sodium sulfate is judged and by whom.", "questions": [ { "id": "condition-assessment-q01", "text": "What identifies and describes the condition of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "condition-assessment-q02", "text": "Who or what asserted this about the condition of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "condition-assessment-q03", "text": "What may an agent decide or do once the condition of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "place-and-movement", "name": "Place and movement", "description": "Where a sodium sulfate is, how it got there and where it may go (varies).", "rationale": "A thing that can move needs its position recorded with a time, or every later claim about it is about a place it has left.", "layers": [ { "id": "location-and-placement", "name": "Location and placement", "description": "Position, containment and the reference frame the position is given in.", "findings": [ { "id": "position-and-frame", "name": "Position, container and reference frame", "description": "Where a sodium sulfate is, and what that position is measured against.", "questions": [ { "id": "position-and-frame-q01", "text": "What identifies and describes the location of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "position-and-frame-q02", "text": "Who or what asserted this about the location of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "position-and-frame-q03", "text": "What may an agent decide or do once the location of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "movement-and-transfer", "name": "Movement and transfer", "description": "How a sodium sulfate is carried, installed or relocated.", "findings": [ { "id": "movement-events", "name": "Movement events and constraints", "description": "What counts as a movement, what records it and what limits it.", "questions": [ { "id": "movement-events-q01", "text": "What identifies and describes the movement of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "movement-events-q02", "text": "Who or what asserted this about the movement of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "movement-events-q03", "text": "What may an agent decide or do once the movement of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "state-and-lifecycle", "name": "State and lifecycle", "description": "The states a sodium sulfate passes through and the events that move it between them.", "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.", "layers": [ { "id": "lifecycle-stages", "name": "Lifecycle stages", "description": "From coming into existence to ceasing to be one of these.", "findings": [ { "id": "stages-and-transitions", "name": "Stages and transitions", "description": "The stages worth naming and what moves a sodium sulfate between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "stages-and-transitions-q02", "text": "Who or what asserted this about the lifecycle of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "stages-and-transitions-q03", "text": "What may an agent decide or do once the lifecycle of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "observations-and-status", "name": "Observations and current status", "description": "What is observed about a sodium sulfate, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a sodium sulfate is recorded so that it can be superseded rather than overwritten.", "questions": [ { "id": "observation-record-q01", "text": "What identifies and describes an observation of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "observation-record-q02", "text": "Who or what asserted this about an observation of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "observation-record-q03", "text": "What may an agent decide or do once an observation of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "use-and-operation", "name": "Use and operation", "description": "What can be done with a sodium sulfate and what it takes to do it.", "rationale": "An agent that can recognise a thing but not act on it has only half a model.", "layers": [ { "id": "intended-use", "name": "Intended use and function", "description": "What a sodium sulfate is for, and what it is used for anyway.", "findings": [ { "id": "function-and-purpose", "name": "Function, purpose and misuse", "description": "The function a sodium sulfate performs and the uses that fall outside it.", "questions": [ { "id": "function-and-purpose-q01", "text": "What identifies and describes the use of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "function-and-purpose-q02", "text": "Who or what asserted this about the use of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "function-and-purpose-q03", "text": "What may an agent decide or do once the use of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "handling-and-procedure", "name": "Handling and procedure", "description": "The steps, skills and tools involved in using a sodium sulfate.", "findings": [ { "id": "procedures-and-skills", "name": "Procedures, skills and required tools", "description": "What an agent needs before it can act on a sodium sulfate at all.", "questions": [ { "id": "procedures-and-skills-q01", "text": "What identifies and describes handling a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "procedures-and-skills-q02", "text": "Who or what asserted this about handling a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "procedures-and-skills-q03", "text": "What may an agent decide or do once handling a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "supply-and-consumption", "name": "Supply and consumption", "description": "Quantities, rates and what running out means.", "findings": [ { "id": "consumption-and-stock", "name": "Consumption, stock and replenishment", "description": "How much of a sodium sulfate there is and how fast it goes.", "questions": [ { "id": "consumption-and-stock-q01", "text": "What identifies and describes the supply of a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "consumption-and-stock-q02", "text": "Who or what asserted this about the supply of a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "consumption-and-stock-q03", "text": "What may an agent decide or do once the supply of a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] }, { "id": "composition-and-identity", "name": "Composition, grade and chemical identity", "description": "What sodium sulfate is made of and how pure the thing in hand is.", "rationale": "Grade decides what a substance may be used for, so a model that records only the name cannot support any decision about use.", "layers": [ { "id": "chemical-identity", "name": "Chemical identity", "description": "Formula, structure and the registry numbers that name it unambiguously.", "findings": [ { "id": "identity-record", "name": "Identity and registry numbers", "description": "What identifies this substance across suppliers and regulators.", "questions": [ { "id": "identity-record-q01", "text": "What formula, structure and registry identifiers name sodium sulfate unambiguously?", "kind": "definition" }, { "id": "identity-record-q02", "text": "Which related substances share a name in common use but not an identifier?", "kind": "boundary" } ] } ] }, { "id": "grade-and-impurities", "name": "Grade, purity and impurities", "description": "The specification a batch meets and what else is in it.", "findings": [ { "id": "specification", "name": "Specification and assay", "description": "How purity is stated and measured, and which impurities matter.", "questions": [ { "id": "specification-q01", "text": "What grades of sodium sulfate exist, how is purity assayed, and which impurities are limited?", "kind": "measurement" }, { "id": "specification-q02", "text": "Which use requires which grade, and what happens when a lower grade is substituted?", "kind": "action" } ] } ] } ] }, { "id": "properties-and-behaviour", "name": "Properties and behaviour", "description": "How sodium sulfate behaves under conditions an agent can measure or change.", "rationale": "Physical constants are the part of a substance model that transfers between contexts, and each needs its unit and its conditions.", "layers": [ { "id": "physical-constants", "name": "Physical constants", "description": "Values that hold for the pure substance, with their conditions.", "findings": [ { "id": "constants-record", "name": "Constants and conditions", "description": "The quantities worth recording and the state they apply in.", "questions": [ { "id": "constants-record-q01", "text": "What are the defining physical constants of sodium sulfate, in what units and under what conditions?", "kind": "measurement" }, { "id": "constants-record-q02", "text": "Which of these values change with grade or form rather than being fixed?", "kind": "boundary" } ] } ] }, { "id": "stability-and-reactivity", "name": "Stability and reactivity", "description": "What it reacts with, degrades into, and how it is stored.", "findings": [ { "id": "incompatibilities", "name": "Incompatibilities and degradation", "description": "What must not meet it, and what it becomes over time.", "questions": [ { "id": "incompatibilities-q01", "text": "What is sodium sulfate incompatible with, and what does it degrade into under storage?", "kind": "definition" }, { "id": "incompatibilities-q02", "text": "What storage and handling does that require, and who is competent to do it?", "kind": "action" } ] } ] } ] }, { "id": "hazard-and-regulation", "name": "Hazard classification and regulation", "description": "How sodium sulfate can harm, and what the law says about holding and moving it.", "rationale": "A substance model without its hazard class and its regulatory identity is unusable in exactly the situations that matter.", "layers": [ { "id": "hazard-class", "name": "Hazard classification", "description": "Classified hazards, exposure limits and protective measures.", "findings": [ { "id": "classified-hazards", "name": "Classified hazards and limits", "description": "The classification, the scheme it belongs to, and the limits set.", "questions": [ { "id": "classified-hazards-q01", "text": "How is sodium sulfate classified for hazard, under which scheme, and what exposure limits apply?", "kind": "definition" }, { "id": "classified-hazards-q02", "text": "What protection does handling require, and what must an agent refuse to do without it?", "kind": "action" } ] } ] }, { "id": "regulatory-identity", "name": "Regulatory identity and control", "description": "Registration, restriction and transport rules by jurisdiction.", "findings": [ { "id": "controls", "name": "Controls and jurisdiction", "description": "Where it is restricted and what the restriction attaches to.", "questions": [ { "id": "controls-q01", "text": "Which registrations, restrictions or transport rules cover sodium sulfate, and where?", "kind": "provenance" }, { "id": "controls-q02", "text": "Does the control attach to the substance, its concentration, or its intended use?", "kind": "boundary" } ] } ] } ] }, { "id": "provenance-and-evidence", "name": "Provenance, evidence and time", "description": "Where every claim about a sodium sulfate came from and when it held.", "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.", "layers": [ { "id": "source-and-authority", "name": "Source and authority", "description": "Who said it, on what evidence, and how strongly.", "findings": [ { "id": "claim-provenance", "name": "Claim provenance and confidence", "description": "The authority behind each claim about a sodium sulfate and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "claim-provenance-q02", "text": "Who or what asserted this about a claim about a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "claim-provenance-q03", "text": "What may an agent decide or do once a claim about a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "time-and-versions", "name": "Time, versions and supersession", "description": "When a claim was true, when it was learnt, and what replaced it.", "findings": [ { "id": "validity-and-supersession", "name": "Validity period and supersession", "description": "How an old claim about a sodium sulfate is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a sodium sulfate, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "validity-and-supersession-q02", "text": "Who or what asserted this about the validity of a claim about a sodium sulfate, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "validity-and-supersession-q03", "text": "What may an agent decide or do once the validity of a claim about a sodium sulfate is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 9, "layers": 20, "findings": 22, "questions": 60 } } } }