hexaamminenickel chloride
Enable an agent to recognise hexaamminenickel chloride, assess whether a sample retains its intended composition and coordination state, and determine its suitability for an authorised chemical use.
Bundle → Layer → Finding → Questions Filled
5 bundles · 9 layers · 15 findings · 23 questions
Salt and coordination identity Establish the complete nickel ammine chloride identity and its boundaries against neighbouring substances.
Formula and charge
Resolve the metal, ammonia ligands and counterions.
Complete salt identity
The identity anchor is [Ni(NH3)6]Cl2, comprising a nickel-ammonia complex cation and chloride counterions. Source: [University of Malaya laboratory manual](https://chemistry.um.edu.my/doc/Lab%20Manual/SIC1012_LaboratorySkills.pdf).
- Does the material claim the complete [Ni(NH3)6]Cl2 salt, with formal Ni(II) and two chloride counterions? definition
- What evidence distinguishes coordinated ammonia from a mixture of nickel chloride and ammonia-containing residues? measurement
Identifier and neighbour boundaries
Connect names and database representations without merging distinct substances.
Source-qualified identity mapping
PubChem presents a matching name and formula under CID 22221640; identifier assignments should retain their source and representation rather than be inferred from name similarity. Source: [PubChem compound record](https://pubchem.ncbi.nlm.nih.gov/compound/Hexaamminenickel_II_chloride).
- Which CAS, EC and PubChem records explicitly describe this complete salt, and do their formulas agree? provenance
- Does a candidate match instead describe nickel chloride hydrate, another counterion salt or only the complex cation? boundary
Batch composition and verification Determine whether an actual sample meets the intended salt composition and purity.
Stoichiometry and residues
Separate compound composition from water and residual preparation materials.
Composition on a declared basis
Record nickel, chloride, ammonia and water measurements with methods and reporting bases; treat departures from nominal ratios as evidence requiring interpretation.
- What are the measured NH3:Ni and Cl:Ni molar ratios, and what uncertainty accompanies them? measurement
- How were coordinated ammonia, free ammonia, ammonium chloride and water distinguished in the assay? measurement
Coordination and phase evidence
Require evidence capable of discriminating the intended compound from compositionally similar material.
Orthogonal identity confirmation
Retain diffraction, spectroscopy or other suitable identity evidence alongside elemental assays; appearance alone does not establish coordination or phase purity.
- Which measured features support six ammonia ligands around nickel and the intended solid phase? measurement
- Which reference material or published dataset supports the comparison, and what alternative phases remain unresolved? provenance
Condition-dependent state Track whether the material retains its identity during storage, dissolution and thermal exposure.
Solid retention and thermal events
Relate observed solid-state changes to temperature, atmosphere and exposure history.
Ammonia retention assessment
Assess possible changes in ammonia content and phase identity without assigning unsupported decomposition temperatures or storage limits.
- Under what temperature, humidity, atmosphere and duration was the sample stored or tested? provenance
- Do mass-loss, evolved-gas and phase measurements identify ammonia loss, water loss, melting or another event? measurement
Dissolution and solution speciation
Distinguish the introduced salt from the species present after dissolution.
Solution identity is conditional
Record solvent, temperature, pH, ammonia availability and elapsed time before interpreting dissolved nickel as the intact hexaammine complex.
- Under the recorded solution conditions, what evidence establishes the fraction of nickel remaining as the hexaammine complex? measurement
- When does ligand exchange or another transformation require describing the solution through neighbouring species models? boundary
Use qualification and handling Translate verified composition and condition into documented decisions about use, handling and disposition.
Fitness for intended use
Connect assay and state evidence to the requirements of a particular application.
Use-specific acceptance
Define acceptance using the intended role of the compound, including nickel delivery, ammonia stoichiometry and tolerance for chloride or water.
- Does the intended task require verified intact hexaammine salt, a known nickel quantity or both? action
- Which limits on water, residual ammonium chloride, other metals and altered phases determine batch acceptance? boundary
Documented exposure and disposition
Ground handling and waste decisions in matched documentation and the proposed operation.
Operation-specific handling evidence
Resolve applicable nickel-compound requirements and potential ammonia-release conditions from current sources; leave exact classifications and exposure limits unset until verified.
- Which current substance-matched SDS and jurisdictional sources establish classification, exposure limits and waste requirements? provenance
- What approved controls and disposition route apply to the proposed operation and the sample's measured condition? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
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.
- Which of these check these first hold for the sense of hexaamminenickel 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.
- Which of these identifiers and schemes hold for the sense of hexaamminenickel 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.
- Which of these standards and regulation hold for the sense of hexaamminenickel 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.
- Which of these real-world use hold for the sense of hexaamminenickel chloride this model covers, and on what evidence? provenance
Typical measurements
Recalled without web access and unsourced; every item is a lead to verify.
- Which of these typical measurements hold for the sense of hexaamminenickel 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.
- Which of these failure modes and hazards hold for the sense of hexaamminenickel 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.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of hexaamminenickel chloride this model covers, and on what evidence? provenance
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
What it is Filled
Hexaamminenickel chloride is a nickel(II) coordination salt, [Ni(NH3)6]Cl2, containing an approximately octahedral cation with six ammonia ligands bound to nickel and two chloride counterions.
In scope
- Nickel(II), six coordinated ammonia ligands and two chloride counterions per formula unit
- Substance identifiers and evidence connecting them to the registered thing
- Sample purity, water content, residual reagents and ammonia retention
- Solid-phase identity and condition-dependent solution speciation
- Measured properties, stability evidence and substance-specific handling constraints
Out of scope
- Chloride as a general ion, whose model supplies inherited counterion concepts
- Nickel(II) chloride and its hydrates as distinct substances
- The isolated hexaamminenickel(II) cation without specification of its counterions
- Other nickel ammine salts and complexes with different ligands
- Complete synthesis processes, laboratory equipment and commercial product formulations
Why it exists Filled
Enable an agent to recognise hexaamminenickel chloride, assess whether a sample retains its intended composition and coordination state, and determine its suitability for an authorised chemical use.
Distinguishing features Filled
- Establish nickel as the metal centre and its formal oxidation state as +2, excluding similarly named cobalt ammine compounds.
- Establish six ammonia ligands per nickel; elemental composition alone must not be treated as proof of their coordination.
- Establish two chloride counterions per complex cation, distinguishing this chloride salt from other hexaamminenickel salts.
- Distinguish coordinated NH3 from water in nickel chloride hydrates and from free ammonia or ammonium chloride contamination.
- Treat colour as supporting evidence only; confirm identity through composition and a coordination-sensitive or phase-sensitive method.
What robots and AI may and may not do Filled
Must not
- Handle it without gloves or dust control.
- Use it in demonstrations for children without proper supervision and protection.
- Dispose of nickel waste into drains or general rubbish.
Only with a human decision
- Approving its use in schools or disposal of bulk quantities.
May
- Describe the complex's octahedral structure and its use in teaching coordination chemistry.
- Report the hazards of nickel compounds from safety data.
Moral aspects Filled
- Nickel compounds sensitise skin and can cause cancer, so students must be protected.
Who is affected
- Students and teachers
- Laboratory staff
Owners Filled
Steward
The laboratory or school that holds it; the supplier answers for its labelling.
Links to other meta-models Filled
parent
- Q11173 - registry parent class
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.hexaamminenickel-chloride
- Wikidata: Q4498202 (https://www.wikidata.org/wiki/Q4498202)
Direct properties required Filled
- Chemical identity: Hexaamminenickel(II) chloride; [Ni(NH3)6]Cl2; empirical formula Cl2H18N6Ni
- Registry and external identity mappings: vr.tr.hexaamminenickel-chloride linked to source-qualified CAS, PubChem and EC records
- Nickel coordination: Formal Ni(II); six NH3 ligands; observed geometry and supporting method
- Component ratios: mol NH3/mol Ni and mol Cl/mol Ni; nominal values 6 and 2
- Purity and assay basis: Mass percent, method, uncertainty and as-received or dry basis
- Water and residual reagents: Mass percent water, free ammonia, ammonium chloride and other identified residues
- Physical and chemical state: Solid, dissolved or mixed phase; temperature, solvent, pH and elapsed time where relevant
- Thermal and dissolution behaviour: °C for identified thermal events; g/L or mol/L for solubility under stated conditions
- Applicable hazard and use status: Substance-matched SDS, jurisdiction, revision date, classification and authorised use conditions
Recognition required Filled
- Violet to blue-violet crystals.
- Smells of ammonia as it slowly loses ammonia in air.
Capabilities and actions required Filled
- Match a labelled material to the registered substance using reconciled identifiers and analytical evidence.
- Calculate substance quantities from verified composition and assay basis.
- Accept, qualify or reject a batch against use-specific purity and coordination requirements.
- Evaluate whether dissolution, storage or heating has changed the material's identity or suitability.
- Select an approved handling or waste route from applicable documentation and the sample's actual condition.
Hazards and failure modes required Filled
- Nickel compounds can cause allergic skin reactions and are suspected carcinogens.
- Releases ammonia when heated or left open.
Standards and interfaces required Filled
- Globally Harmonized System of Classification and Labelling of Chemicals (GHS), United Nations.
Context of use required Filled
- Hexaamminenickel chloride is encountered in coordination chemistry teaching and research as an example of a nickel complex containing ammonia ligands.
- It supports studies of coordination geometry and ligand exchange, with sample suitability depending on retention of its intended chemical composition.
Sources Filled
- Wikidata item Q4498202: hexaamminenickel chloride - identity and sense of the item
- Wikipedia: Hexaamminenickel chloride - general description of the item
Open questions
- Which CAS and EC assignments are authoritative for this salt, and how should differently represented PubChem records be reconciled?
- Which reference diffraction or spectroscopic data best distinguish the intended phase from nickel chloride hydrates and partially altered ammine material?
- What measured solubility and solution-speciation data apply across relevant temperature, pH and ammonia concentrations?
- What storage and thermal studies establish ammonia retention, decomposition stages and whether reported melting or boiling values are meaningful?
- Which current substance-specific hazard classifications, exposure limits and waste requirements apply in the intended jurisdiction?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q4498202/spec.json