acetic acid
Enable an AI agent to identify acetic acid, assess the composition and condition of a particular sample, and determine which uses and handling actions its evidence supports.
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 AI agent to identify acetic acid, assess the composition and condition of a particular sample, and determine which uses and handling actions its evidence supports.
Acetic acid (ethanoic acid, CH3COOH) is a two-carbon monocarboxylic acid that, when pure, is a colourless, hygroscopic liquid near ordinary room temperature and is the principal acid in vinegar.
It can be Resolve a sample label to acetic acid and flag mismatches with acetate salts, esters, anhydride or formulated products.; Compare measured composition and certification against the requirements of a proposed use.; Calculate acetic acid quantities or dilution targets when concentration basis, density where needed and an approved procedure are available.; Assess whether crystallization, water uptake or contamination requires conditioning, resampling or quarantine.; Screen proposed storage, transfer and reaction contacts against documented compatibility evidence.; Identify the applicable hazard controls and unresolved evidence before authorizing handling..
Distinguishing features
Chemical identity must establish CH3COOH, distinguishing it from formic acid, other carboxylic acids and similarly named compounds.
An acetate salt contains an associated counterion and is not interchangeable with acetic acid; an aqueous sample may contain both acetic acid and acetate according to its conditions.
Acetic anhydride and acetate esters have different chemical structures and must not be accepted as acetic acid on name similarity alone.
A vinegar label identifies a product containing acetic acid, not a pure acetic acid sample; other constituents and the concentration basis must be recorded.
The label 'glacial acetic acid' requires supporting composition evidence; it does not by itself establish exact purity, absence of water or current physical state.
Scope
+ Chemical identity and authoritative registry identifiers for acetic acid, also called ethanoic acid
+ Acetic acid content, water content, impurities and documented grade
+ Physical state and measured properties under specified temperature, pressure and composition
+ Acid-base behaviour, chemical compatibility and relevant reaction potential
+ Concentration-dependent hazards, exposure controls and jurisdiction-specific classifications
+ Sample provenance, storage condition and evidence of suitability for an intended use
- Vinegar and other formulated products as complete products
- Acetate salts, acetate esters and acetic anhydride as separately identified substances
- Manufacturing plants, fermentation systems and synthesis processes
- Biological acetate metabolism and organism-level effects
- Equipment designs for storage, dosing, ventilation or processing
- Clinical management of exposure and site-wide emergency response
Characteristics
- Chemical and regulatory identity
- CH3COOH; verified CAS number, PubChem CID and EC number with source and identity scope Prevents substitution of a related acetate compound or product and supports matching authoritative substance records.
- Acetic acid content
- % mass fraction, % volume fraction or mol/L, with explicit basis, method and applicable temperature Concentration affects dosing, physical properties, hazards and whether a sample meets a use requirement.
- Water content
- % mass fraction or mg/kg, with analytical method and uncertainty Water distinguishes concentrated material from aqueous solutions and can determine reaction and specification suitability.
- Impurity profile
- Named impurities with mg/kg or other explicit units, detection limits and method An acetic acid assay alone cannot establish suitability where trace contaminants matter.
- Grade and conformity evidence
- Declared technical, reagent, food or other grade; named specification, revision and conformity status Grade claims need supporting criteria before an agent can approve a sample for a particular use.
- Physical state
- Liquid, solid or partially crystallized, with temperature, pressure and composition Crystallization or incomplete melting can affect transfer, sampling and representativeness.
- Physical property measurements
- Melting/freezing range in °C, boiling point in °C at stated pressure, density in kg/m³ and vapour pressure in Pa at stated temperature Condition-specific values support storage and process decisions without treating pure-substance constants as solution properties.
- Aqueous acidity
- pH and titratable acidity with concentration, temperature, method and titration endpoint pH and total acid content describe different aspects of a sample and cannot substitute for one another.
- Hazard and exposure status
- Applicable GHS implementation, concentration-specific classification, SDS revision and exposure limits with units and averaging periods Handling decisions require rules that match the actual material, jurisdiction and exposure scenario.
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.acetic-acid
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 5 bundles · 9 layers · 17 findings · 25 questions.
Acetic acid identity Establishes what the registered substance is and how samples and related substances attach to that identity.
Acetic acid, acetate species and acetic-acid-containing products share terminology but require different decisions.
Molecular and registry identity
Connects the molecular identity to verified names and external substance records.
Identity anchor
Record evidence that the material is acetic acid and that each identifier refers to the same substance.
- Which authoritative records establish the names acetic acid and ethanoic acid, molecular identity CH3COOH, CAS number, PubChem CID and EC number? definition
- Which supplier or analytical records connect this sample to that identity, and do any identifiers instead describe a mixture? provenance
Substance and mixture boundaries
Separates acetic acid identity from aqueous speciation, related compounds and product identity.
Acid, acetate and product boundary
Record whether a reference concerns acetic acid, an aqueous acid-acetate system or a product requiring its own model.
- Does the material designation refer to acetic acid, an acetate salt, an ester, acetic anhydride or a formulation such as vinegar? boundary
- For an aqueous or buffered sample, does the reported amount mean undissociated acetic acid, total acid-acetate content or titratable acidity? definition
Composition and grade Describes how much acetic acid a sample contains and whether its composition supports a claimed grade or use.
Concentrated acid, dilute solutions and certified grades cannot be treated as interchangeable material.
Acid and water assay
Makes concentration claims comparable and identifies what an assay actually measures.
Quantified composition
Require explicit concentration bases and independent evidence where total acidity does not uniquely identify acetic acid content.
- What are the acetic acid and water contents, expressed on which bases and measured by which methods? measurement
- Could other acids or buffering constituents affect the assay, and what evidence distinguishes acetic acid content from total titratable acidity? measurement
Impurities and use specifications
Connects batch evidence to explicit acceptance criteria.
Grade-supported use
Treat grade and 'glacial' designations as claims requiring specifications and sample-level evidence.
- Which specification defines the claimed grade or glacial designation, and which batch certificate supports compliance? provenance
- Which impurity limits and analytical detection limits must be satisfied before this sample can be accepted for the intended use? action
Physical state and chemical behaviour Relates observable sample condition and chemical behaviour to composition and operating conditions.
Pure acetic acid constants and aqueous solution behaviour cannot be applied without checking the material and conditions.
Phase and property envelope
Records phase observations and condition-specific physical properties.
Condition-matched properties
Associate each property value with composition, temperature, pressure and its measurement or reference basis.
- What phase is observed, and what melting/freezing, boiling, density and vapour-pressure data apply to this composition under the relevant conditions? measurement
- If the sample is partially crystallized, what approved conditioning and sampling procedure establishes a representative composition before use? action
Acidity and reaction context
Separates acid strength, measured acidity and compatibility for specific proposed contacts.
Reaction-relevant acidity
Record the solvent and composition context needed to interpret acidity and assess reaction proposals.
- Which solvent, concentration and temperature define the reported pH, dissociation data or titratable acidity? measurement
- For proposed contact with bases, oxidizers, metals or other reagents, what evidence establishes heat release, gas generation and compatibility constraints? action
Hazards and material stewardship Connects actual composition and sample history to applicable controls and permitted handling.
The name acetic acid alone does not establish a solution's hazard classification, exposure controls or storage suitability.
Classification and exposure
Identifies applicable hazard evidence and occupational exposure criteria.
Composition-specific hazard record
Match classifications and exposure limits to the material, jurisdiction and current source.
- Which current SDS and jurisdiction-specific GHS rules establish the skin, eye, inhalation and flammability classifications for this composition? provenance
- Which occupational exposure limits apply, with what units, averaging periods and measurement methods? measurement
Storage, transfer and disposition
Tracks whether a sample remains suitable for storage, transfer, use or disposal.
Sample condition and handling decision
Use container compatibility, handling history and current evidence to support a specific next action.
- What container, closure and contact-material compatibility evidence applies at this acetic acid concentration and storage temperature? action
- What evidence of water uptake, contamination, leakage or composition change requires retesting, quarantine or routing to an approved waste process? 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 knowledge; no sources were consulted.
- Verify current grade specifications, jurisdiction-specific hazard classifications, and occupational exposure limits before regulatory or operational use.
- Physical constants given here describe pure material approximately; water content, temperature, pressure, and measurement method affect reported values.
- Which of these check these first hold for the sense of acetic acid this model covers, and on what evidence? provenance
Kinds and varieties
Recalled without web access and unsourced; every item is a lead to verify.
- Glacial acetic acid: nearly anhydrous material
- Aqueous acetic acid solutions, distinguished by concentration
- Technical-grade acetic acid
- Reagent-grade acetic acid
- Food-grade acetic acid
- Pharmacopoeial-grade acetic acid
- Which of these kinds and varieties hold for the sense of acetic acid 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 - 64-19-7 - Identifies acetic acid; does not specify concentration or grade.
- PubChem CID - 176 - Compound identifier for acetic acid.
- EC number - 200-580-7 - European substance inventory identifier.
- EU food additive E number - E260 - Food additive designation for acetic acid; not a general certification of food-grade purity.
- Which of these identifiers and schemes hold for the sense of acetic acid 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 Nations Globally Harmonized System of Classification and Labelling of Chemicals (GHS): framework for communicating chemical hazards.
- American Chemical Society (ACS), Reagent Chemicals: specifications for reagent-grade acetic acid.
- United States Pharmacopeia (USP), Food Chemicals Codex (FCC): specifications for food ingredient identity and purity.
- Which of these standards and regulation hold for the sense of acetic acid this model covers, and on what evidence? provenance
Real-world use
Recalled without web access and unsourced; every item is a lead to verify.
- Acidulant and preservative in food, including vinegar-based products.
- Feedstock for vinyl acetate monomer used in polymers and adhesives.
- Production of acetate esters used as solvents.
- Chemical process solvent, including in terephthalic acid manufacture.
- Laboratory reagent for acidification and preparation of acetate buffers.
- Which of these real-world use hold for the sense of acetic acid 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 - 60.05 - g/mol
- Melting point of pure acetic acid at approximately atmospheric pressure - 16.6 - °C
- Normal boiling point of pure acetic acid at 101.325 kPa - 118.1 - °C
- Density of pure liquid at approximately 20 °C - 1.05 - g/cm³
- Aqueous acid dissociation pKa at approximately 25 °C - 4.76 - dimensionless
- Which of these typical measurements hold for the sense of acetic acid 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.
- Concentrated acetic acid is corrosive and can cause severe skin burns and eye damage; weak-acid behaviour does not imply low hazard.
- Vapour and mist irritate the eyes and respiratory tract.
- Concentrated material is flammable and can form ignitable vapour-air mixtures when sufficiently warm.
- Contact with strong bases or incompatible oxidizing agents can produce substantial heat or hazardous reactions.
- Acetic acid can attack susceptible metals, potentially releasing hydrogen and contaminating the material.
- Which of these failure modes and hazards hold for the sense of acetic acid 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 labelling may use E260, INS 260, or the substance name, depending on jurisdiction.
- Occupational exposure limits, mixture classification thresholds, and transport requirements depend on jurisdiction and concentration.
- Food, reagent, and pharmacopoeial grades follow different specifications; a grade designation should identify the applicable specification.
- Which of these regional variation hold for the sense of acetic acid 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.
- Vinegar - Vinegar is a dilute aqueous food product containing acetic acid and other constituents, rather than the pure chemical substance.
- Acetate - Acetate denotes the conjugate-base ion CH3COO− or related salts and esters, rather than molecular acetic acid.
- Acetic anhydride - Acetic anhydride is a distinct compound, (CH3CO)2O, that reacts with water to form acetic acid.
- Formic acid - Formic acid has one carbon atom and formula HCOOH, whereas acetic acid has two carbon atoms.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of acetic acid this model covers, and on what evidence? provenance
What the second pass must settle
- Does an existing Vercy world model already cover acetic acid and require this registry entry to link to it instead of creating a second publication?
- Which authoritative identity records and property references should anchor the model, and what composition and condition ranges do their values cover?
- Which specifications define glacial, reagent, technical and food grades in the intended deployment jurisdictions?
- Which concentration-dependent hazard classifications and current occupational exposure limits apply where the material will be used?
- Which intended uses require impurity-specific testing, validated container compatibility or conditioning procedures beyond a general acetic acid assay?