HuagongsheHuagongshe Chemistry Print Report · For research reference only
Phosphorous acid
Phosphorous acid 50% aqueous solution · Phosphorou acid · Orthophosphorus acid · AD Orthophosphorus acid · Orthophosphorus acid ISO 9001：2015 REACH
Identifiers & Physical Properties
| CAS No. | 10294-56-1 |
|---|---|
| Molecular formula | H3O3P |
| Average molar mass | 81.996 g/mol |
| Monoisotopic mass | 81.98198059 g/mol |
| SMILES | OP(O)O |
| InChIKey | OJMIONKXNSYLSR-UHFFFAOYSA-N |
| PubChem CID | 107909 |
| ChEBI | CHEBI:36361 |
| EC No. | 233-663-1 |
| DTXSID | DTXSID7035511 |
Chemical & Physical Properties
| XLogP | -1.5 |
|---|---|
| Topological polar surface area | 60.7 |
| Hydrogen bond donors | 3 |
| Hydrogen bond acceptors | 3 |
| Rotatable bonds | 0 |
| Heavy atoms | 4 |
| Formal charge | 0 |
| Complexity | 8 |
| Physical Description | LiquidSolid |
| pKa (acidity coefficient) | 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 | 10294-56-1 |
| FDA UNII | 35V6A8JW8E |
| NIST Chemistry Reference | H3PO3(10294-56-1) |
| EPA Substance Registry System | Phosphorous acid (10294-56-1) |
| GHS pictogram | GHS05,GHS07 |
| Signal word | Danger |
| GHS hazard statements | H302-H314 |
| GHS precautionary statements | P264-P270-P260-P280-P301+P312-P330-P301+P330+P331-P303+P361+P353-P363-P304+P340-P310-P305+P351+P338-P405-P501 |
| Hazard symbols | Xn,C |
| Risk statements (R) | 22-35 |
| Safety statements (S) | 1/2-26-36/37/39-45 |
| UN transport number | UN 2834 |
| TSCA inventory status | TSCA listed |
| Hazard class | 8 |
| Packing group | III |
Safety & Regulations
| GHS classification | DangerH302: 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.H302 (89.3%): Harmful if swallowed [Warning Acute toxicity, oral] |
|---|---|
| Regulatory information | Chemical: Phosphorous acidPhosphorous 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 information | IMAP 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 CORROSIVEinhalation, ingestion or skin contact with material may cause severe injury or death. |
| DOT ID and guide | 2834 154 |
| EPA Safer Chemical | Chemical: Phosphorous acid |
| DOT Hazard Classification | Phosphorous acidUN2834Class 8 Corrosive material (49 eCFR § 173.136)PG III: the degree of danger presented by the material is minor |
| Hazard Classes and Categories | Acute Tox. 4 (89.3%)Acute toxicity - category 4Self-reactive substances and mixtures - Type GAcute Tox. 4 * |
| Accidental release measures | · CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.· ELIMINATE all ignition sources (no smoking, flares, sparks or flames) from immediate area. |
| First aid | General First Aid: |
| Exposure control and personal protection | · Wear positive pressure self-contained breathing apparatus (SCBA). |
| Isolation and Evacuation | Immediate precautionary measure |
| Protective Action Criteria (PAC) | 3.0 [mg/m3]30 [mg/m3]150 [mg/m3] |
| Emergency Response Planning Guidelines | Small Fire |
| TSCA inventory status | TSCA listed |
| UN transport number | UN 2834 |
| Risk statements (R) | 22-35 |
| Signal word | Danger |
| GHS pictogram | GHS05,GHS07 |
| Hazard symbols | Xn,C |
| Safety statements (S) | 1/2-26-36/37/39-45 |
| Hazard class | 8 |
| Packing group | III |
| GHS hazard statements | H302-H314 |
| GHS precautionary statements | P264-P270-P260-P280-P301+P312-P330-P301+P330+P331-P303+P361+P353-P363-P304+P340-P310-P305+P351+P338-P405-P501 |
Applications & Uses
Uses
Phosphorous acid is a reducer in chemical reactions and a raw material in the making of phosphorous acid salts. A plant defoliant.