formic acid
Enable an agent to recognise formic acid, assess the identity and condition of a particular sample, and determine which handling or use decisions its composition and evidence support.
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 recognise formic acid, assess the identity and condition of a particular sample, and determine which handling or use decisions its composition and evidence support.
Formic acid, also called methanoic acid, is the simplest carboxylic acid, with molecular formula CH2O2 and structural formula HCOOH, occurring as a colourless, pungent liquid near room temperature when pure.
It can be Resolve substance names and identifiers while separating formic acid from formates and formulated products.; Compare an assay and impurity profile with the requirements of a proposed use.; Interpret measurements using the sample's concentration, temperature and pressure.; Assess proposed dilution, neutralisation or reaction roles against composition and compatibility evidence.; Select applicable handling information and flag missing exposure, storage or transport evidence.; Accept, quarantine or reject a sample for a specified application based on traceable observations..
Distinguishing features
Molecular identity matches HCOOH, also written CH2O2, with hydrogen attached to the carboxyl carbon; acetic acid instead has a methyl group at that position.
The sample's acid component is distinguished from a formate salt by protonation state and the presence or absence of a counterion; aqueous dissociation does not by itself establish a salt product.
Structural evidence distinguishes formic acid from formaldehyde and methanol, which are different compounds despite related names and carbon chemistry.
A stated formic-acid percentage identifies a sample composition, not a different molecular substance; concentration basis and water content must accompany it.
A formate ester has an organic group replacing the acidic hydrogen and must not be identified as formic acid merely because its name contains 'formate'.
Scope
+ Molecular identity, names and chemical registry identifiers
+ Sample composition, water content, concentration basis, impurities and grade
+ Physical state and measured properties under stated conditions
+ Acid-base behaviour, chemical transformations and material compatibility
+ Concentration-dependent hazards, exposure assessment and use constraints
+ Sample provenance, storage condition and fitness for an intended application
- Formate salts and formate esters as independently identified substances
- Complete formulations and products containing formic acid
- Industrial production plants and detailed manufacturing procedures
- Ant biology and other organisms that produce or encounter formic acid
- Equipment design and facility-wide safety management
- Clinical management of exposure or poisoning
Characteristics
- Chemical identity
- Formic acid / methanoic acid; HCOOH; identifiers verified against named chemical registries Anchors the registry entry to a specific substance and prevents confusion with salts, esters and similarly named compounds.
- Formic acid content
- Mass fraction, % w/w, mol/L or another explicitly declared basis; temperature where relevant Controls dosing, property interpretation and the applicability of handling information.
- Water content
- % w/w or mg/kg with analytical method Distinguishes concentrated material from aqueous solutions and affects reactivity and application suitability.
- Impurity profile
- Named impurities in mg/kg, % w/w or method-specific limits, including detection limits An assay alone may not establish suitability for sensitive analytical, industrial or biological uses.
- Grade and acceptance specification
- Supplier-declared grade linked to an explicit specification and certificate of analysis A grade label must be connected to measurable requirements before an agent relies on it.
- Physical state
- Liquid, solid or multiphase; temperature, pressure and composition recorded Supports interpretation of crystallisation, transfer behaviour and sample uniformity.
- Phase-transition behaviour
- Melting/freezing temperature and boiling temperature in °C or K, with pressure and composition Pure-substance values cannot automatically describe an aqueous or impure sample.
- Density and vapour pressure
- Density in kg/m³ or g/mL; vapour pressure in Pa or kPa; temperature and concentration required Supports quantity conversion and assessment of vapour generation.
- Acid-base condition
- pH for a specified aqueous sample and method; pKa with solvent and temperature Separates sample acidity from intrinsic acid dissociation behaviour.
- Contact-material compatibility
- Material or substance linked to compatibility evidence at a stated concentration, temperature and duration Determines whether containers, seals and process-contact materials are suitable.
- Applicable hazard and exposure record
- Classification, safety data sheet and exposure limits linked to composition, jurisdiction, authority and revision date Prevents using a hazard label or exposure limit outside its applicable context.
- Sample disposition
- Unverified, accepted for specified use, quarantined or rejected, with evidence and decision date Makes uncertainty and use restrictions operationally visible.
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.formic-acid
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 19 findings · 29 questions.
Identity and substance boundary Establishes what counts as formic acid and how related chemical identities are separated.
Confusing the acid with a formate salt, ester or commercial mixture changes the meaning of every subsequent decision.
Molecular and registry identity
Connects HCOOH and its names to authoritative identity records.
Formic acid identity anchor
The model should connect formic acid and methanoic acid to the same molecular substance and record verified external identifiers.
- Which structural representation establishes that the substance is HCOOH rather than another one-carbon compound? definition
- Which authoritative records verify its CAS number, PubChem CID and EC number, and when were those records checked? provenance
Acid, formate and product boundaries
Separates molecular identity, solution speciation and product composition.
Acid versus related material
An aqueous acid sample, an isolated formate salt and a formulation containing formic acid require distinct descriptions.
- Does the record describe formic acid, a formate salt, a formate ester or a mixture containing one or more of them? boundary
- How are dissolved formate species distinguished from a claim that the supplied material is a formate salt? definition
Composition and use grade Characterises the actual acid sample through assay, water content and impurity evidence.
A formic-acid label does not establish concentration or fitness for a particular application.
Acid and water balance
Makes concentration statements interpretable and comparable.
Concentration with a declared basis
The sample needs a measured acid content, a concentration basis and sufficient composition information to interpret the balance.
- What is the measured formic acid content, on which basis, and with what uncertainty? measurement
- Was water measured independently, and is any remaining fraction identified rather than assumed to be water? measurement
Impurities and application acceptance
Connects analytical evidence to the requirements behind a grade claim.
Grade supported by analysis
Grade and suitability should be justified by a specification and batch evidence rather than inferred from acid percentage alone.
- Which impurities and analytical limits does the intended application require the sample to meet? boundary
- Which batch certificate and methods demonstrate compliance with the claimed grade? provenance
Physical state and property conditions Describes phase and physical properties as functions of composition and conditions.
Formic acid and its aqueous mixtures cannot be evaluated reliably using unqualified handbook constants.
Phase and thermal behaviour
Relates observed liquid or solid states to temperature, pressure and composition.
Phase evidence for the sample
Phase observations and transition measurements should refer to the actual concentration or a clearly identified pure-substance reference.
- At what temperature, pressure and acid concentration was the sample observed to be liquid, solid or multiphase? measurement
- Which melting, freezing and boiling data apply to this composition, and what pressure accompanies the boiling data? provenance
Density and volatility
Captures the physical evidence needed for quantity conversion and vapour assessment.
Conditioned property values
Density and vapour-pressure values must retain the temperature and composition for which they are valid.
- Which density value supports converting the sample's measured volume to mass at its actual temperature and concentration? measurement
- What vapour-pressure or vapour-liquid equilibrium evidence applies across the proposed operating conditions? provenance
Chemical behaviour and compatibility Represents acid-base behaviour and other transformations relevant to use and containment.
Formic acid's behaviour cannot be reduced to a pH reading or a generic carboxylic-acid label.
Acidity and formate speciation
Separates intrinsic dissociation behaviour from the measured condition of a solution.
Acidity in a defined medium
The model should retain solvent, concentration, temperature and method when describing acidity or formate formation.
- Which solvent, temperature and dissociation data support the proposed acid-formate speciation assessment? measurement
- What composition and measurement method make the reported pH interpretable for this sample? measurement
Transformations and contact materials
Connects intended reactions and unintended interactions to their actual conditions.
Reaction and compatibility evidence
Intended transformations, possible decomposition pathways and contact-material decisions require condition-specific evidence.
- Which evidence establishes relevant reaction or decomposition pathways, including possible gas generation, under the proposed thermal and catalytic conditions? provenance
- Are the proposed container, seal and transfer materials compatible with this concentration, temperature and contact duration? action
Hazards and sample disposition Connects applicable hazard information and sample history to practical use decisions.
Safe and suitable use depends on the supplied composition, current evidence and condition of the particular sample.
Classification and exposure context
Identifies which hazard and exposure records govern the material and activity.
Applicable safety record
Classification and exposure limits should be recorded with their concentration scope, jurisdiction and source date.
- Which current GHS-based classification and safety data sheet apply to the supplied formic acid concentration in the relevant jurisdiction? provenance
- Which airborne exposure limits apply, with what units, averaging periods and issuing authority? measurement
Storage history and release for use
Uses provenance and current observations to judge whether the sample remains suitable.
Evidence-based sample disposition
Release for a specified use should consider batch identity, container condition, storage excursions and any changes in assay or appearance.
- What batch, opening, storage and container records support the sample's current identity and composition? provenance
- Which observations or missing records require reanalysis, quarantine or rejection before the intended use? 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 or current regulatory records were consulted.
- Verify jurisdiction-specific hazard classifications, concentration thresholds and occupational exposure limits before operational use.
- Listed physical constants refer to the pure substance under the stated conditions; commercial aqueous grades require concentration-specific data.
- Which of these check these first hold for the sense of formic 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.
- Anhydrous formic acid
- Aqueous formic acid solutions, distinguished by concentration
- Technical-grade formic acid
- Reagent-grade formic acid
- Which of these kinds and varieties hold for the sense of formic 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 - 64-18-6 - Identifies formic acid; does not specify concentration or grade.
- PubChem CID - 284 - Compound identifier for formic acid.
- EC number - 200-579-1 - European substance inventory identifier.
- IUPAC nomenclature - Methanoic acid - Systematic name; formic acid is a retained name.
- Which of these identifiers and schemes hold for the sense of formic 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 provides the framework for hazard communication.
- European Union CLP Regulation governs substance and mixture classification, labelling and packaging.
- European Union REACH Regulation governs chemical registration and associated supply-chain obligations.
- Which of these standards and regulation hold for the sense of formic 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.
- Preservation and acidification of silage and animal feed.
- Leather processing and textile dyeing or finishing.
- Coagulation of natural rubber latex.
- Chemical synthesis as an acid, reagent and source of formate derivatives.
- Mobile-phase additive in liquid chromatography, including mass-spectrometry-compatible methods.
- Which of these real-world use hold for the sense of formic 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 - 46.03 - g/mol
- Melting point of pure substance - Approximately 8.4 - °C
- Boiling point of pure substance at 101.325 kPa - Approximately 100.8 - °C
- Density of pure liquid near 20 °C - Approximately 1.22 - g/cm³
- Acid dissociation constant, pKa, in water near 25 °C - Approximately 3.75 - dimensionless
- Which of these typical measurements hold for the sense of formic 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 formic acid is corrosive and can cause severe skin burns and eye damage.
- Vapour or mist can injure the respiratory tract; inhalation toxicity is a significant concern.
- Concentrated material can burn when sufficiently heated, despite being miscible with water.
- Contact with bases can release substantial heat; contact with susceptible metals can release hydrogen.
- Under strongly dehydrating conditions, formic acid can release toxic carbon monoxide.
- Which of these failure modes and hazards hold for the sense of formic acid this model covers, and on what evidence? provenance
Regional variation
Recalled without web access and unsourced; every item is a lead to verify.
- Hazard labels and concentration thresholds depend on jurisdictional implementation of chemical classification rules.
- Occupational exposure limits and averaging periods differ between national authorities.
- Permissions for feed, food-related or biocidal uses depend on jurisdiction, formulation and intended application.
- Which of these regional variation hold for the sense of formic 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.
- Acetic acid - Acetic acid has a methyl group attached to the carboxyl group; formic acid has hydrogen in that position.
- Formate - Formate is the deprotonated anion HCOO−; formic acid is the neutral acid HCOOH.
- Formic acid solution - A solution is a mixture with a specified solvent and acid concentration; the substance identity alone does not define those properties.
- Formaldehyde - Formaldehyde, CH2O, is an aldehyde rather than a carboxylic acid.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of formic acid this model covers, and on what evidence? provenance
What the second pass must settle
- Which authoritative sources confirm the external identifiers and whether an existing Vercy world model already owns this substance?
- Which concentration-dependent phase, density and vapour-liquid equilibrium datasets should support the model, including any relevant azeotropic behaviour?
- Which impurities, assay methods and acceptance limits distinguish the formic acid grades needed by the registry's intended users?
- Which current classifications, exposure limits and transport requirements apply in the intended jurisdictions and concentration ranges?
- Which compatibility and stability studies establish usable boundaries for storage materials, temperature, contamination and gas-generating decomposition?