potassium chloride
Enable an agent to identify potassium chloride, assess the condition and fitness of a particular sample or lot, and determine which uses require further evidence or controls.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
recalled by Codex without web access - no source was read
Researched by: Codex
Purpose and description
Enable an agent to identify potassium chloride, assess the condition and fitness of a particular sample or lot, and determine which uses require further evidence or controls.
Potassium chloride (KCl) is an inorganic ionic compound composed of potassium cations and chloride anions in a 1:1 ratio, occurring naturally as the mineral sylvite and forming a water-soluble crystalline solid under ordinary ambient conditions.
It can be Compare identity and assay evidence with a potassium chloride specification.; Calculate KCl or potassium content from measured composition using an explicit reporting basis.; Assess whether a lot meets documented requirements for a proposed application.; Plan non-clinical dissolution or recrystallisation using verified solubility data and stated conditions.; Identify when moisture, caking, contamination or missing documentation requires retesting or segregation.; Retrieve applicable handling, storage and disposal requirements for the particular grade and form..
Distinguishing features
Identification must establish both potassium and chloride with composition consistent with KCl; detecting chloride alone cannot distinguish it from sodium chloride or calcium chloride.
The potassium-to-chloride formula ratio is 1:1; potassium carbonate contains a different anion, while calcium chloride contains a different cation and stoichiometry.
A white crystalline appearance is compatible with KCl but is insufficient for identification because many salts share it.
A product containing KCl is distinguished from the substance by its additional constituents and formulation; its total mass must not be treated as KCl mass.
Food, fertiliser, laboratory and pharmaceutical grade labels do not establish interchangeability; each requires evidence against its applicable specification.
Scope
+ Chemical identity and distinction from other chloride salts and potassium compounds
+ KCl content, impurities, moisture and evidence supporting a declared grade
+ Solid form, particle properties and behaviour in solution under stated conditions
+ Measured physical properties with units, methods and conditions
+ Lot provenance, hazard evidence and eligibility for a specified use
- The chloride ion and properties shared by chloride compounds generally
- Other potassium salts and other metal chlorides
- Finished fertilisers, foods, medicines and electrolyte formulations containing KCl
- Mining, extraction and manufacturing processes as operational systems
- Clinical diagnosis, prescribing and patient-specific potassium replacement
- Sylvite deposits and geological bodies as mineral resources
Characteristics
- Chemical identity
- Potassium chloride; formula KCl Establishes the specific potassium salt rather than the broader chloride class.
- Substance identifiers
- Verified CAS, PubChem and EC records, with source and identity scope Connects the substance to external records without confusing it with a solution or formulated product.
- KCl assay
- Mass percent, stating as-received or dry basis and analytical method Supports purity assessment and calculation of actual KCl content.
- Impurity profile
- Named analytes in mg/kg or mass percent, with detection limits Distinguishes lots whose similar KCl assays conceal different suitability constraints.
- Water content
- Mass percent, with method and sampling conditions Affects assay interpretation, handling and preparation by mass.
- Declared grade
- Technical, fertiliser, food, pharmaceutical, reagent or other specified grade Identifies the intended specification while leaving compliance to supporting evidence.
- Physical form and condition
- Crystalline solid, powder, granules or dissolved constituent; free-flowing, caked or visibly contaminated Determines relevant handling and measurement requirements.
- Particle-size distribution
- Micrometres or millimetres; sieve fractions or stated distribution metric Helps assess dust generation, flow and dissolution behaviour.
- Solubility and thermal properties
- Solubility in g KCl per 100 g solvent; melting and boiling temperatures in °C, with conditions and sources Supports solution preparation and assessment of behaviour under temperature changes.
- Potassium reporting basis
- KCl mass, elemental potassium mass or K2O-equivalent nutrient content Prevents incompatible assay and fertiliser declarations from being compared directly.
- Applicable hazard and use status
- Source document, jurisdiction, revision date, grade, form and intended use Makes permission and handling judgments traceable to evidence applicable to the material.
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 17 findings · 27 questions.
KCl identity and boundaries Establishes the specific salt and separates its identity from chloride generally and from products containing it.
Chloride detection, appearance and product naming can each produce a false identification of potassium chloride.
Ionic composition
Evidence that the material contains potassium and chloride in composition consistent with KCl.
Potassium chloride identification
Record complementary identity evidence rather than relying on colour, crystal appearance or a chloride-only test.
- Which analytical results establish potassium and chloride and support the 1:1 formula ratio? measurement
- What evidence distinguishes this sample from sodium chloride, calcium chloride and potassium carbonate? boundary
Substance and product identity
Links verified identifiers while preserving the boundary between KCl and its mineral, solution or formulation context.
Identifier and material scope
Record whether a name or identifier denotes potassium chloride itself or a material containing it.
- Which authoritative records verify the CAS number, PubChem CID and EC number for potassium chloride? provenance
- Does the supplied material represent KCl, a sylvite-bearing mineral sample, a solution or a formulated product requiring a linked model? boundary
Assay, grade and nutrient basis Captures actual KCl content, relevant contaminants and the meaning of grade and potassium declarations.
A KCl label does not establish purity or suitability, and potassium declarations can use incompatible reporting bases.
Composition evidence
Assay and impurity measurements tied to a sample and reporting basis.
Assay and impurity accounting
Record KCl assay, water and named impurities with methods, limits and analytical basis.
- What is the KCl mass fraction, and is it reported on an as-received or dry basis? measurement
- What measurements constrain sodium, magnesium, calcium, other anions and contaminants relevant to the proposed use? measurement
Specification and reporting basis
Interprets grade claims and distinguishes substance assay from nutrient declarations.
Grade and potassium declaration
Link the grade to a named specification and preserve whether content is expressed as KCl, potassium or K2O equivalent.
- Which specification and edition define the declared grade, and which lot-specific results demonstrate compliance? provenance
- Is the content declaration expressed as KCl, elemental potassium or K2O equivalent, and how was any conversion made? definition
Solid and solution behaviour Describes the sample's physical condition and the conditions governing thermal and dissolution behaviour.
Particle form, water content and temperature affect how a KCl lot can be measured, stored and dissolved.
Solid form and condition
Characterises the supplied solid and changes affecting its handling.
Particles, moisture and caking
Record particle distribution, water content and observed aggregation without assuming that appearance establishes chemical purity.
- What particle-size distribution, moisture content and degree of caking characterise the sampled lot? measurement
- Do observed changes justify resampling, retesting or conditioning before the intended operation? action
Condition-dependent properties
Keeps solubility and thermal values attached to their experimental conditions.
Dissolution and thermal limits
Record verified property data with solvent, temperature, pressure and concentration conventions.
- What solubility data apply to the specified solvent and temperature, and is the denominator solvent mass or solution mass? measurement
- Which sources establish melting and boiling behaviour, at what pressure and for what purity? provenance
- Would the proposed concentration and temperature path cause incomplete dissolution or crystallisation? action
Lot evidence and use constraints Connects a particular KCl lot to supporting documents and constraints for a proposed application.
Chemical identity alone cannot justify grade substitution or establish applicable handling and use requirements.
Lot traceability
Connects the material being assessed to its producer, sampling history and analytical documents.
Lot document consistency
Check that identity, assay, grade and condition evidence all apply to the same material.
- Do the container label, certificate of analysis and sampling record identify the same KCl lot and grade? provenance
- Have repackaging, storage exposure or mixing with other lots weakened the applicability of the original evidence? boundary
Application and handling eligibility
Determines which documented conditions govern use of this grade and physical form.
Use-specific evidence
Keep hazard classification, exposure controls and application requirements specific to their jurisdiction and material scope.
- Which current hazard classifications and exposure limits or dust-control provisions apply to this KCl material in the relevant jurisdiction? provenance
- What additional evidence is required before this lot can be accepted for the proposed fertiliser, food, laboratory or pharmaceutical application? action
- Which storage, incompatibility and disposal requirements are supported by documentation applicable to this grade and form? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Check these first
Recalled without web access and unsourced; every item is a lead to verify.
- This is recall only; no sources or current regulatory texts were consulted.
- Verify physical constants against references specifying temperature, pressure, purity and measurement basis.
- Check current monograph requirements and jurisdiction-specific GHS classifications and exposure limits; no classification or numerical exposure limit is asserted here.
- Which of these check these first hold for the sense of potassium chloride this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Fertilizer-grade potassium chloride, commonly called muriate of potash
- Technical-grade potassium chloride
- Reagent-grade potassium chloride
- Food-grade potassium chloride
- Pharmaceutical-grade potassium chloride
- Which of these kinds and varieties hold for the sense of potassium chloride this model covers, and on what evidence? provenance
Identifiers and schemes
Recalled without web access and unsourced; every item is a lead to verify.
- Chemical formula - KCl - Specifies the stoichiometric ratio of ions, not a discrete molecule in the crystal.
- CAS Registry Number - 7447-40-7 - Identifies potassium chloride; does not specify grade or purity.
- PubChem CID - 4873 - Compound identifier recalled without database verification.
- EC number - 231-211-8 - European chemical substance inventory identifier.
- Food additive E number - E508 - Food additive identity; the identifier alone does not establish authorization for a particular use.
- Which of these identifiers and schemes hold for the sense of potassium chloride this model covers, and on what evidence? provenance
Standards and regulation
Recalled without web access and unsourced; every item is a lead to verify.
- United States Pharmacopeia-National Formulary: potassium chloride monograph issued by the United States Pharmacopeial Convention.
- European Pharmacopoeia: potassium chloride monograph maintained by the European Directorate for the Quality of Medicines & HealthCare.
- Food Chemicals Codex: potassium chloride specification published by the United States Pharmacopeial Convention.
- Which of these standards and regulation hold for the sense of potassium chloride this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Potassium nutrient source in fertilizers.
- Ingredient in salt substitutes and reduced-sodium foods.
- Potassium source in pharmaceutical electrolyte preparations.
- Electrolyte in reference electrodes and salt bridges.
- Preparation of conductivity calibration solutions of specified concentration and temperature.
- Which of these real-world use hold for the sense of potassium chloride this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Molar mass - 74.55 - g/mol
- Melting point near atmospheric pressure - approximately 770 - °C
- Crystal density near room temperature - approximately 1.98 - g/cm³
- Solubility in water at approximately 20 °C - approximately 34 - g KCl per 100 g water
- Which of these typical measurements hold for the sense of potassium chloride this model covers, and on what evidence? provenance
Failure modes and hazards
Recalled without web access and unsourced; every item is a lead to verify.
- Excessive potassium exposure can cause dangerous disturbances of cardiac function.
- Dust can irritate eyes and respiratory passages.
- Chloride-containing solutions can promote corrosion of susceptible metals.
- Moisture uptake and impurities can cause caking or compromise analytical performance.
- Confusing fertilizer or technical grades with food or pharmaceutical grades can introduce unacceptable contaminants.
- Which of these failure modes and hazards hold for the sense of potassium chloride this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Food additive permissions, purity requirements and labeling rules depend on jurisdiction and intended use.
- Pharmaceutical acceptance depends on the applicable pharmacopoeia and product requirements.
- Fertilizer nutrient declarations may express potassium content as K₂O equivalent even though the material contains potassium chloride.
- Which of these regional variation hold for the sense of potassium chloride this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Recalled without web access and unsourced; every item is a lead to verify.
- chloride - Chloride denotes the Cl⁻ ion or the broader class of its compounds; potassium chloride specifically pairs chloride with potassium in a 1:1 ratio.
- sodium chloride - Contains sodium rather than potassium as the cation.
- potassium carbonate - Contains carbonate rather than chloride as the anion and has the formula K₂CO₃.
- sylvite - Names the naturally occurring mineral species whose ideal composition is KCl; potassium chloride also includes manufactured material.
- potassium chloride solution - A mixture of potassium chloride and solvent requiring a concentration specification, rather than the pure substance.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of potassium chloride this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative identity records should supply the verified CAS number, PubChem CID and EC number?
- Which reference sources and conditions should govern adopted solubility, melting-point and boiling-point values?
- Which grade specifications and impurity limits are required for the applications this catalogue will support?
- What current jurisdiction-specific hazard classifications and exposure provisions apply, including the distinction between substance-specific limits and general particulate limits?
- Does the existing catalogue already contain a world model for potassium chloride, and which existing chloride, sylvite, solution and product models should this entry link to?