{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.hydrochloric-acid","code":"thing-q2409","url":"https://ver.cy/models/thing/q2409/","name":"hydrochloric acid","alternateNames":[],"kind":"thing","status":"published","version":"0.1.0-research.1","language":"en","classifiers":{"family":"Thing Registry","category":"Physical world and living systems","entryKind":"thing","plane":"PHY","domain":["PHY.MAT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"Aqueous hydrogen chloride (HCl(aq)), a strong monoprotic mineral acid whose practical identity is the concentration and grade of the water-HCl mixture rather than the anhydrous gas.","purpose":"Enable an AI agent to recognise an aqueous hydrochloric acid material, assess its composition and condition, and determine which uses, transfers or restrictions are justified by the available evidence.","scope":{"in":["Identification of aqueous hydrogen chloride as hydrochloric acid","Hydrogen chloride concentration, reporting basis and compositional uncertainty","Grade, impurities, additives and changes caused by use or storage","Physical condition and concentration-dependent behaviour","Chemical compatibility and suitability for an identified intended use"],"out":["Anhydrous hydrogen chloride gas and liquefied hydrogen chloride","Equipment, containers and storage facilities as independently managed assets","Manufacturing, dilution, cleaning and neutralisation procedures","Human exposure, clinical treatment and occupational health records","Transport consignments, permits and waste-management workflows"],"boundaries":[]},"distinguishingFeatures":["Establish that the material is hydrogen chloride dissolved in water; a hydrogen chloride identifier alone does not distinguish hydrochloric acid from anhydrous hydrogen chloride.","Require evidence for both hydrochloric acidity and chloride-containing composition; low pH alone also describes other acids.","Distinguish hydrochloric acid from chloride salt solutions: chloride detection alone does not establish that hydrogen chloride is the defining acidic component.","Treat 'muriatic acid' as a possible commercial name for hydrochloric acid, then verify concentration and additives rather than assigning a different substance identity.","Distinguish hydrochloric acid from mixed-acid formulations and spent process liquors by establishing whether other acids, dissolved reaction products or additives now define the material's behaviour."],"structure":{"bundles":[{"id":"aqueous-acid-identity","name":"Aqueous acid identity","description":"Establish whether the material is hydrochloric acid and where that classification stops.","layers":[{"id":"aqueous-hydrogen-chloride","name":"Aqueous hydrogen chloride","description":"Connect the material's name to evidence of its defining aqueous composition.","findings":[{"id":"identity-evidence","name":"Identity evidence","description":"The agent must distinguish a supported aqueous hydrochloric acid identity from an unverified label.","questions":[{"text":"What evidence establishes that this material is hydrogen chloride dissolved in water?","id":"identity-evidence-q01","kind":"definition"},{"text":"Which supplier record or analytical result supports the identity, and does it apply to this batch?","id":"identity-evidence-q02","kind":"provenance"}]}]},{"id":"mixture-boundaries","name":"Mixture boundaries","description":"Resolve commercial names and compositions that may require a neighbouring mixture model.","findings":[{"id":"commercial-and-process-boundary","name":"Commercial and process boundary","description":"Names such as muriatic acid do not settle composition, and use can turn hydrochloric acid into a materially different process mixture.","questions":[{"text":"Does a commercial name denote aqueous hydrochloric acid alone or a formulation with behaviour-changing additives?","id":"commercial-and-process-boundary-q01","kind":"definition"},{"text":"Do other acids or accumulated reaction products require classification under a mixed-acid or process-liquor model?","id":"commercial-and-process-boundary-q02","kind":"boundary"}]}]}]},{"id":"concentration-and-analytical-basis","name":"Concentration and analytical basis","description":"Record hydrochloric acid strength without confusing concentration conventions or analytical proxies.","layers":[{"id":"hcl-content","name":"Hydrogen chloride content","description":"Capture the amount of hydrogen chloride represented by the reported concentration.","findings":[{"id":"concentration-basis","name":"Concentration basis","description":"Every concentration claim must distinguish its reporting basis and whether it was measured, specified or calculated.","questions":[{"text":"What is the hydrogen chloride concentration, and is it expressed as mass fraction, amount per volume or another defined basis?","id":"concentration-basis-q01","kind":"measurement"},{"text":"If the value was converted, which density, temperature and composition assumptions support that conversion?","id":"concentration-basis-q02","kind":"provenance"}]}]},{"id":"analytical-interpretation","name":"Analytical interpretation","description":"Determine what acidity, chloride and density observations actually establish.","findings":[{"id":"proxy-limitations","name":"Limits of analytical proxies","description":"Acidity and chloride results need interpretation when other acids, salts or additives may be present.","questions":[{"text":"Does the analytical method distinguish hydrogen chloride content from total acidity or total chloride?","id":"proxy-limitations-q01","kind":"measurement"},{"text":"Which sample preparation, interfering constituents or measurement limitations affect confidence in the reported result?","id":"proxy-limitations-q02","kind":"boundary"}]}]}]},{"id":"grade-and-material-condition","name":"Grade and material condition","description":"Assess purity claims and whether the current material still matches its documented composition.","layers":[{"id":"grade-and-constituents","name":"Grade and constituents","description":"Link grade names to explicit limits and batch-specific evidence.","findings":[{"id":"purity-and-additive-evidence","name":"Purity and additive evidence","description":"The model must expose the constituents and specification limits that matter for the proposed application.","questions":[{"text":"Which specification defines the claimed grade, including relevant impurity limits?","id":"purity-and-additive-evidence-q01","kind":"provenance"},{"text":"Which impurities and intentional additives were measured or declared, and which remain unassessed?","id":"purity-and-additive-evidence-q02","kind":"measurement"}]}]},{"id":"condition-and-change","name":"Condition and change","description":"Relate present observations to events that could alter the acid.","findings":[{"id":"composition-drift","name":"Composition drift","description":"Dilution, evaporation, contamination and prior reactions can invalidate an earlier composition claim.","questions":[{"text":"What changes in appearance, solids or analytical results have been observed since the last accepted assessment?","id":"composition-drift-q01","kind":"measurement"},{"text":"What storage, opening, transfer or use history could have changed hydrogen chloride content or introduced contaminants?","id":"composition-drift-q02","kind":"provenance"}]}]}]},{"id":"reactivity-and-contact-compatibility","name":"Reactivity and contact compatibility","description":"Represent the chemical interactions that constrain contact, mixing and handling decisions.","layers":[{"id":"mixing-and-reaction-partners","name":"Mixing and reaction partners","description":"Identify proposed interactions requiring a specific hazard assessment.","findings":[{"id":"reaction-specific-action-boundaries","name":"Reaction-specific action boundaries","description":"The agent must account for heat during dilution or neutralisation, potential hydrogen generation with susceptible metals and potential chlorine generation with hypochlorites.","questions":[{"text":"Which proposed contact or mixing partners introduce heat, gas evolution or other hazardous reaction concerns?","id":"reaction-specific-action-boundaries-q01","kind":"boundary"},{"text":"What material-specific assessment and authorised procedure are required before the proposed interaction may proceed?","id":"reaction-specific-action-boundaries-q02","kind":"action"}]}]},{"id":"wetted-materials-and-vapour","name":"Wetted materials and vapour","description":"Assess contact surfaces and potential release behaviour under the actual conditions.","findings":[{"id":"conditional-compatibility","name":"Conditional compatibility","description":"A compatibility claim must address the actual contacting material, acid composition and exposure conditions.","questions":[{"text":"What evidence supports compatibility of the proposed contacting materials at this concentration, temperature and duration?","id":"conditional-compatibility-q01","kind":"provenance"},{"text":"What assessment of hydrogen chloride vapour or acid mist release constrains the proposed handling conditions?","id":"conditional-compatibility-q02","kind":"boundary"}]}]}]},{"id":"use-suitability-and-disposition","name":"Use suitability and disposition","description":"Translate identity, composition and compatibility evidence into a bounded material-use decision.","layers":[{"id":"application-requirements","name":"Application requirements","description":"Compare the actual material with the chemical requirements of its intended use.","findings":[{"id":"application-specific-fit","name":"Application-specific fit","description":"Suitability must reference acceptable concentration, impurity limits and additive restrictions for an identified application.","questions":[{"text":"What concentration range, impurity limits and additive restrictions apply to the intended use?","id":"application-specific-fit-q01","kind":"boundary"},{"text":"Does current batch evidence satisfy those requirements, and which gaps prevent a supported decision?","id":"application-specific-fit-q02","kind":"action"}]}]},{"id":"release-and-reassessment","name":"Release and reassessment","description":"Record a use decision and the events that invalidate it.","findings":[{"id":"bounded-material-disposition","name":"Bounded material disposition","description":"Approval applies to a stated material condition and use; unresolved identity or composition requires an explicit restriction.","questions":[{"text":"Is this material supported for the stated use, restricted, quarantined or rejected, and what evidence supports that disposition?","id":"bounded-material-disposition-q01","kind":"action"},{"text":"Which events, such as dilution, contamination, return from a process or changed contact conditions, require reassessment?","id":"bounded-material-disposition-q02","kind":"boundary"}]}]}]},{"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.","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.","questions":[{"text":"Which of these kinds and varieties hold for the sense of hydrochloric acid this model covers, and on what evidence?","id":"evidence-kinds-q01","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.","questions":[{"text":"Which of these identifiers and schemes hold for the sense of hydrochloric acid this model covers, and on what evidence?","id":"evidence-identifiers-q01","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.","questions":[{"text":"Which of these standards and regulation hold for the sense of hydrochloric acid this model covers, and on what evidence?","id":"evidence-standards-and-regulation-q01","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.","questions":[{"text":"Which of these real-world use hold for the sense of hydrochloric acid this model covers, and on what evidence?","id":"evidence-real-world-use-q01","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.","questions":[{"text":"Which of these typical measurements hold for the sense of hydrochloric acid this model covers, and on what evidence?","id":"evidence-measurements-q01","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.","questions":[{"text":"Which of these failure modes and hazards hold for the sense of hydrochloric acid this model covers, and on what evidence?","id":"evidence-failure-modes-and-hazards-q01","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.","questions":[{"text":"Which of these regional variation hold for the sense of hydrochloric acid this model covers, and on what evidence?","id":"evidence-regional-variation-q01","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.","questions":[{"text":"Which of these neighbouring kinds and how to tell them apart hold for the sense of hydrochloric acid this model covers, and on what evidence?","id":"evidence-neighbours-q01","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Store, label and handle hydrochloric acid with proper containment and protective equipment.","Report concentration, grade and hazard information from safety data sheets."],"mustNot":["Assist in using the acid to harm people, animals or property.","Mix it with bleach or other incompatible chemicals.","Store it in unlabelled or food and drink containers.","Pour it into drains or the environment without neutralization and permission."],"requiresHuman":["Responding to a spill or exposure involving people.","Supplying concentrated acid to another person."]},"ethics":{"considerations":["Acid attacks cause lifelong injury, and access to strong acids is a public safety issue.","Workers handling acids need protection and training."],"affectedParties":["Workers","Bystanders","Victims of acid attacks"]},"owners":{"steward":"The person or business that holds it; chemical safety authorities regulate supply and storage.","roles":[],"masterSystems":[]},"relations":[{"target":"Q12018897","type":"parent","note":"registry parent class"},{"target":"Q906356","type":"parent","note":"registry parent class"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.hydrochloric-acid","Wikidata: Q2409 (https://www.wikidata.org/wiki/Q2409)"]},"properties":{"applicability":"required","items":["Aqueous hydrochloric acid identity: confirmed | provisionally identified | unresolved | outside scope","Hydrogen chloride content: mass fraction as % w/w, or another explicitly stated basis; include method, date and uncertainty","Amount concentration: mol/L with solution temperature and measured or derived status","Temperature: °C","Density: kg/m³ or g/mL at a stated temperature","Acidity measurement: pH or titratable acidity, with method and any sample dilution explicitly recorded","Grade and conformance: supplier-declared grade, governing specification and conformance status","Impurity and additive profile: identified constituent concentrations in mg/kg, mg/L or another stated basis; include detection limits","Observed material condition: appearance, colour, clarity, solids and reported fuming, with observation conditions","Contact-material compatibility: specific contacting material linked to concentration, temperature, exposure duration and supporting assessment","Intended-use disposition: unassessed | supported for stated use | restricted | quarantined | rejected"]},"recognition":{"applicability":"required","items":["A clear to yellowish liquid giving off sharp, choking fumes in concentrated form.","Containers carrying corrosive hazard pictograms."]},"capabilities":{"applicability":"required","items":["Identify and label an aqueous hydrochloric acid material using composition and provenance evidence.","Compare concentration and impurity results with the requirements of a stated use.","Flag incompatible contact materials or proposed mixing partners for review.","Determine whether a proposed transfer or use has adequate material-specific evidence and procedural authorisation.","Request qualified sampling or reassessment when identity, concentration or condition is uncertain.","Restrict or quarantine material whose composition, contamination history or use suitability is unresolved."]},"hazards":{"applicability":"required","items":["Causes severe burns to skin and eyes.","Fumes irritate and damage the airways."]},"interfaces":{"applicability":"required","items":["Globally Harmonized System of Classification and Labelling of Chemicals, United Nations."]},"context":{"applicability":"required","items":["Aqueous hydrochloric acid is used in laboratories and industry for acidity control, chemical processing and metal surface treatment.","Its suitability for a particular application depends on the concentration, purity and documented grade of the solution."]}},"sources":[{"title":"Hydrochloric acid","url":"https://pubchem.ncbi.nlm.nih.gov/compound/Hydrochloric-acid","note":"Identity, formula, CAS, concentration ranges"},{"title":"Wikidata item Q2409: hydrochloric acid","url":"https://www.wikidata.org/wiki/Q2409","note":"identity and sense of the item"},{"title":"Wikipedia: Hydrochloric acid","url":"https://en.wikipedia.org/wiki/Hydrochloric_acid","note":"general description of the item"}],"openQuestions":["What registry boundary should separate additive-containing hydrochloric acid products and spent acid liquors from independently modelled mixtures?","Which authoritative grade specifications and impurity limits should be supported for the intended applications?","Which analytical methods reliably establish hydrogen chloride content across the concentrations and interfering constituents this model must cover?","Which validated sources provide applicable physical-property, vapour-behaviour and contact-material compatibility data, and what are their limits?","What evidence and reassessment criteria are required to retain a use disposition after prolonged storage, opening or transfer?"],"resources":{"spec":"/models/things/publications/thing-q2409/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q2409/spec.json"],"providers":["Codex","Grok"],"researchStatus":"unreviewed","generatedAt":"2026-09-07T13:42:48Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"filled","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-07T10:10:29+00:00: completeness 1.00; sense: Wikidata description; 3 live sources; review by codex: pass"},"score":1.0}}