Phosphorous acid
Completing data — refresh the page later to see the latest
Basic information
- CAS
10294-56-1- Standard SMILES
OP(O)O- InChIKey
OJMIONKXNSYLSR-UHFFFAOYSA-N- Molecular formula
- H3O3P
- Average molar mass
- 81.996 g/mol
- Monoisotopic mass
- 81.98198059
Overview
Phosphorous acid is a phosphorus oxoacid. It is a conjugate acid of a dihydrogenphosphite. It is a tautomer of a phosphonic acid.
Names & identifiers
- Preferred name
- Phosphorous acid
- IUPAC
- phosphorous acid
- English name
- Orthophosphorus acid
- Molecular formula
- H3O3P
- Molecular weight
- 82
Names & synonyms
Phosphorous acid10294-56-1Orthophosphorus acidDTXSID7035511CHEBI:36361RefChem:1095536DTXCID5015511233-663-135V6A8JW8EDihydroxyphosphine oxideTrihydroxyphosphinePhosphorane, trihydroxy-
Show more names
Phosphorous acid 50% aqueous solutionPhosphorou acidAD Orthophosphorus acidOrthophosphorus acid ISO 9001：2015 REACH
Orthophosphorous acidCaswell No. 663ItrioxophosphatePhophorous acidtrioxidophosphatePhosphorous-acid-EINECS 233-663-1UN2834
Database identifiers
- CAS
10294-56-1、14901-63-4- PubChem CID
- 107909
- DTXSID
DTXSID7035511- ChEBI
CHEBI:36361- EC Number
- 233-663-1
- Nikkaji
- J95.182J
Properties
Computed structural propertiesFilling in
- XLogP
- -1.5
- Topological polar surface area
- 60.7 Ų
- Hydrogen bond donors
- 3
- Hydrogen bond acceptors
- 3
- Rotatable bonds
- 0
- Heavy atoms
- 4
- Formal charge
- 0
- Complexity
- 8
Experimental & physicochemical properties
Physical Description
Liquid
Solid
Physicochemical properties
- pka
- 2.22 · 2.22±0.10(Predicted)
- InChI
- InChI=1S/H3O3P/c1-4(2)3/h1-3H
- InChIKey
- OJMIONKXNSYLSR-UHFFFAOYSA-N
- SMILES
- P(O)(O)O
- CAS DataBase Reference
- 10294 · 10294-56-1
- FDA UNII
- 35 V6A8JW8E · 35V6A8JW8E
- NIST Chemistry Reference
- 3 PO3 · H3PO3(10294-56-1)
- EPA Substance Registry System
- Phosphorous acid (10294-56-1)
- Symbol(GHS)
- 5 · GHS05,GHS07
- Signal word
- Danger
- Hazard statements
- 302 · H302-H314
- Precautionary statements
Safety & regulation
Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.
GHS classification
GHS Classification
Danger
H302: Harmful if swallowed [Warning Acute toxicity, oral]
P260, P264, P270, P280, P301+P317, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P321, P330, P363, P405, and P501 (click each P-code to see the statement)
This chemical does not meet GHS hazard criteria for 0.3% (2 of 719) of reports.
Danger
H302 (89.3%): Harmful if swallowed [Warning Acute toxicity, oral]
Hazard information
Regulatory Information
Chemical: Phosphorous acid
Phosphorous acid is listed on the EPA's Chemical Data Reporting (CDR) system. Manufacturers and importers of Phosphorous acid are required to report information about their production and use of this chemical to the EPA under the Toxic Substances Control Act (TSCA). (40 eCFR Part 711)
Phosphorous acid: Does not have an individual approval but may be used under an appropriate group standard
Other Safety InformationIMAP assessments - Phosphorous acid: Environment tier I assessment
Fire Hazards· Non-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes.
Health Hazards· TOXIC and/or CORROSIVE; inhalation, ingestion or skin contact with material may cause severe injury or death.
DOT ID and Guide2834 154
EPA Safer ChemicalChemical: Phosphorous acid
DOT Hazard Classification
Chemistry & industry
Uses & manufacturing
U.S. Production2023: 5,000,000 - <10,000,000 lb
Consumer UsesLubricating agent
Industry UsesStabilizing agent
Use Classification
EPA Safer Chemical Functional Use Classes -> Oxidants and Oxidant Stabilizers
Safer Chemical Classes -> Yellow triangle - The chemical has met Safer Choice Criteria for its functional ingredient-class, but has some hazard profile issues
General Manufacturing Information
Not Known or Reasonably Ascertainable
Phosphorous acid: ACTIVE
Applications
UsesPhosphorous acid is a reducer in chemical reactions and a raw material in the making of phosphorous acid salts. A plant defoliant.
Upstream & downstream products
Upstream raw materials
Downstream products
Additional notes
Related reactions
196 records
Compound notes
Loading…