ammonium chloride
Enable an agent to identify ammonium chloride, assess the condition and suitability of a specific grade or lot, and determine which handling and use decisions require supporting evidence.
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 ammonium chloride, assess the condition and suitability of a specific grade or lot, and determine which handling and use decisions require supporting evidence.
Ammonium chloride (NH4Cl) is an inorganic salt composed of ammonium cations and chloride anions, normally a white crystalline solid that dissolves readily in water to form a mildly acidic solution.
It can be Reconcile labels and identifiers against the NH4Cl identity and flag ambiguous names.; Compare a lot's assay, impurities and moisture against a named application specification.; Calculate material quantities from verified assay or solution concentration using an explicit basis.; Assess whether dissolution, heating or contact with other materials needs additional compatibility evidence.; Select documented storage, transfer and exposure controls for the material's form and intended operation.; Hold material for testing when identity, condition or grade evidence is insufficient..
Distinguishing features
Identity requires ammonium and chloride as the constituent ions in the NH4Cl composition; detecting either ion alone does not establish ammonium chloride.
Distinguish ammonium chloride from sodium chloride by cation identity, rather than white appearance or chloride content.
Distinguish ammonium chloride from ammonium nitrate and ammonium sulfate by anion identity.
Distinguish NH4Cl from chloramines and quaternary ammonium chlorides by formula and bonding or ion identity; similar names do not imply interchangeable substances.
Distinguish the substance from an aqueous preparation or formulated product by recording concentration, other constituents and the basis of any reported assay.
Scope
+ Chemical identity as the salt NH4Cl and its distinction from related ammonium salts and chlorine-containing substances
+ Solid material and explicitly identified aqueous ammonium chloride preparations
+ Assay, impurities, moisture, particle form, grade and lot provenance
+ Physical properties and chemical behaviour under stated conditions
+ Evidence supporting application suitability, hazard classification and exposure controls
- Industrial processes and equipment that manufacture ammonium chloride
- Complete formulations of batteries, fluxes, fertilizers, foods or medicines containing it
- Clinical diagnosis, prescribing and patient-specific treatment
- Agricultural nutrient plans and soil management
- Independent models of ammonia, hydrochloric acid, other ammonium salts or mineral deposits
Characteristics
- Substance identity
- NH4Cl; verified preferred name, synonyms, CAS number, PubChem CID and EC number Connects records to the correct substance and prevents confusion with similarly named chemicals.
- Grade and specification
- Supplier-declared grade; named specification or standard with edition Suitability depends on documented requirements rather than the substance name alone.
- Assay and impurity profile
- Mass % NH4Cl with as-received or dry basis; individual impurities in mg/kg or specified units Separates nominal identity from the composition of the material actually available.
- Water content
- Mass % water with test method; distinguish from loss on drying Water affects dosing, storage behaviour and interpretation of purity measurements.
- Physical form and condition
- Crystalline solid, powder or aqueous preparation; free-flowing, caked, contaminated or otherwise observed Determines sampling, transfer and handling requirements.
- Particle size
- µm or sieve fraction, with method and distribution Influences dust generation, dissolution and consistency of solid processing.
- Solution concentration and pH
- Mass %, g/L or mol/L with basis; pH at specified concentration and temperature Makes aqueous behaviour and preparation suitability interpretable.
- Condition-dependent physical constants
- Solubility with temperature and concentration basis; density with material state; thermal events in °C at stated pressure Prevents values measured under different conditions from being treated as interchangeable.
- Lot evidence
- Supplier, lot identifier, certificate of analysis, safety data sheet and sampling records Links decisions to evidence about the specific material.
- Hazard and exposure requirements
- Applicable classification, exposure limits, jurisdiction, material form, source and revision date Controls must match the preparation and relevant jurisdiction.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.ammonium-chloride
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 29 questions.
Identity and material boundary Establish what is being identified as ammonium chloride and where that identity stops.
An NH4Cl substance record must remain distinct from similarly named chemicals and products containing the salt.
Chemical identity
Anchor names and identifiers to the ammonium chloride composition.
NH4Cl identity evidence
Record the evidence connecting the material to NH4Cl, with identifiers verified against authoritative records.
- Which verified CAS number, PubChem CID and EC number identify this substance? definition
- What documentation or analytical evidence establishes both ammonium and chloride identity? provenance
Substance and preparation boundary
Separate the substance from its solutions, natural occurrences and formulated products.
Recorded material basis
Make explicit whether observations concern solid ammonium chloride, a defined solution or a constituent within another material.
- Does this record describe solid NH4Cl, an aqueous preparation or NH4Cl within a multicomponent product? boundary
- If the name sal ammoniac appears, does it denote the chemical, a mineral specimen or a commercial preparation here? definition
Grade and lot composition Describe the actual material supplied, including purity claims and their evidence.
Two lots bearing the same substance name can differ in suitability because of impurities, water and specification requirements.
Assay and contaminants
Capture quantitative composition without hiding the measurement basis.
Composition evidence
Record NH4Cl assay, water and relevant impurities with methods, units and reporting limits.
- What is the NH4Cl assay, and is it reported on an as-received or dry basis? measurement
- Which impurities and water measurements are required by the intended specification, and how were they measured? measurement
Grade and traceability
Connect grade claims to a specific lot and acceptance standard.
Lot specification match
Treat technical, reagent, food or pharmaceutical grade as claims requiring a named specification and lot evidence.
- Which specification and edition support the declared grade of this lot? provenance
- Do the certificate of analysis and any incoming tests support acceptance for the proposed application? action
Physical and aqueous state Represent the condition of solid material and the behaviour of defined aqueous preparations.
Particle form, water and solution conditions affect handling and use even when chemical identity is unchanged.
Solid condition
Record particle characteristics and storage-related changes.
Powder and crystal condition
Describe particle size, flow, caking and visible contamination without assuming appearance establishes purity.
- What particle-size distribution and physical form characterize this material? measurement
- Have moisture exposure, caking or contamination changed its suitability for sampling or transfer? action
Aqueous properties
Associate solution measurements with concentration, temperature and preparation history.
Solution property basis
Record concentration, solubility and pH with sufficient conditions to interpret or reproduce them.
- What are the concentration basis, preparation temperature and measured pH of the solution? measurement
- Which solubility evidence supports the proposed concentration across preparation and storage temperatures? action
Thermal and contact behaviour Describe behaviour during heating and contact with chemically relevant materials.
Ammonium chloride requires thermal interpretation and compatibility assessment beyond a simple melting-point field.
Thermal events
Distinguish reported phase changes from dissociation, decomposition and associated gas release.
Qualified thermal data
Require each thermal value to identify its event, pressure and experimental context rather than assigning an unsupported ordinary boiling point.
- Does each reported temperature describe melting, sublimation, dissociation or decomposition, and at what pressure? measurement
- What evidence establishes ammonia and hydrogen chloride release under the proposed heating conditions? provenance
Chemical and equipment contact
Assess contacts involving alkaline materials and chloride-containing solutions.
Contact-specific compatibility
Evaluate possible ammonia liberation and equipment compatibility using actual concentration, temperature and contact conditions.
- Could the proposed contact with an alkaline material liberate ammonia under the operating conditions? action
- What compatibility evidence supports the selected vessel, transfer equipment and seals for this ammonium chloride preparation? provenance
Use and handling decisions Connect material evidence to intended-use acceptance and operational controls.
A recognized substance is not automatically suitable for every use, preparation or exposure setting.
Application acceptance
Identify the material requirements imposed by the proposed role.
Purpose-specific release
Assess the lot against documented requirements for its proposed role, such as a flux ingredient, electrolyte component or other specified use.
- What function will ammonium chloride serve, and which purity, moisture and particle requirements follow from that function? definition
- Which unmet requirements require testing or holding the lot before use? action
Hazards and exposure
Attach current hazard and exposure evidence to the material and operation.
Form-specific controls
Distinguish solid dust, aqueous contact and emissions from heating when choosing documented controls.
- Which current safety data sheet and jurisdiction-specific GHS classification apply to this material or preparation? provenance
- Which applicable exposure limits distinguish ammonium chloride dust or fume from ammonia and hydrogen chloride? measurement
- What ventilation, protective equipment and storage conditions are required for the intended operation? 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 recalled information; no sources were consulted.
- Verify temperature-dependent solubility and thermal behaviour before using these approximate values; the thermal value should not be treated as an ordinary melting or boiling point.
- Check current jurisdiction-specific hazard classifications, exposure limits and grade specifications; these are not established here.
- Which of these check these first hold for the sense of ammonium 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.
- Technical grade
- Reagent grade
- Pharmaceutical grade
- Food grade
- Which of these kinds and varieties hold for the sense of ammonium 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.
- CAS Registry Number - 12125-02-9 - Identifies ammonium chloride.
- PubChem CID - 25517 - Compound identifier for ammonium chloride.
- EC number - 235-186-4 - European substance inventory identifier.
- Chemical formula - NH4Cl - Formula unit of the ionic compound, rather than a discrete molecule in the crystal.
- Which of these identifiers and schemes hold for the sense of ammonium 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.
- Electrolyte ingredient in zinc-carbon dry cells.
- Flux ingredient for soldering, tinning and galvanizing.
- Nitrogen source in some fertilizers.
- Ingredient in some salty liquorice and other food preparations, subject to applicable food rules.
- Laboratory reagent for preparing ammonium-containing solutions and buffers.
- Which of these real-world use hold for the sense of ammonium 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 - 53.49 - g/mol
- Solid density near room temperature - approximately 1.53 - g/cm³
- Solubility in water at approximately 20 °C - approximately 37 - g per 100 g water
- Commonly reported sublimation/decomposition temperature near atmospheric pressure - approximately 338 - °C
- Which of these typical measurements hold for the sense of ammonium 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.
- Dust can irritate the eyes and respiratory tract.
- Ingestion of sufficient quantities can be harmful and disturb acid-base balance.
- Heating releases ammonia and hydrogen chloride through thermal dissociation; vapours can recombine as ammonium chloride particles on cooling.
- Contact with strong bases releases ammonia gas.
- Moisture and chloride-containing solutions can promote corrosion of susceptible metals.
- Which of these failure modes and hazards hold for the sense of ammonium chloride this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Permitted food uses and purity requirements depend on jurisdiction.
- Workplace exposure limits and their treatment of dust or fume depend on the issuing authority.
- Which of these regional variation hold for the sense of ammonium 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.
- Ammonia - Ammonia is NH3, a molecular substance and weak base; ammonium chloride is an ionic salt containing NH4+ and Cl−.
- Sodium chloride - Contains sodium rather than ammonium cations and does not release ammonia when treated with a strong base.
- Ammonium nitrate - Contains nitrate rather than chloride anions and has substantially different oxidizing and thermal hazards.
- Sal ammoniac - A traditional name for ammonium chloride and the name of its naturally occurring mineral; it does not denote a different chemical composition.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of ammonium chloride this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative identity records confirm the CAS number, PubChem CID, EC number and accepted synonym boundaries?
- Which reliable sources resolve the conditions and interpretation of reported melting, sublimation, dissociation and boiling-point entries?
- What verified solubility, density and solution-pH data cover the intended temperature and concentration range?
- Which grade specifications and impurity limits govern the intended application, and what evidence supports the actual lot?
- Which current hazard classifications, occupational exposure limits and compatibility requirements apply in the intended jurisdiction and operation?