Chemical Search
Phosphoric acid
1. Molecular Structure
2. Chemical Identity
| Property | Value |
|---|---|
| IUPAC Name | phosphoric acid |
| CAS Number | 7664-38-2 |
| Molecular Formula | H3O4P |
| SMILES | OP(=O)(O)O |
3. Chemical Properties
| Property | Value |
|---|---|
| Appearance | Unstable orthorhombic crystals or clear syrupy liquid |
| Molecular Weight | 97.995 g/mol |
| TPSA | 77.8 Ų |
| Formal Charge | 0 |
4. Experimental Properties
| Property | Value |
|---|---|
| Density | 1.892 at 77 °F (USCG, 1999) – Denser than water; will sink |
| Solubility | Miscible (NIOSH, 2024) |
| Vapor Pressure | 0.03 mmHg (NIOSH, 2024) |
| Vapor Density | Relative vapor density (air = 1): 3.4 |
| Boiling Point | 407 °C |
| Melting Point | 42.4 °C |
| Flash Point | No data available |
| Autoignition Temp | Not flammable (USCG, 1999) |
| Decomposition | Decomposition products: converted to pyrophosphoric acid (H4P2O7) when heated to 213 °C. |
| Dissociation Constant | pK1: 2.15; pK2: 7.09; pK3: 12.32 |
| pH | pH = 1.5 (0.1 N aqueous solution) |
| LogP | -2.150 |
| Refractive Index | Index of refraction: 1.34203 at 17.5 °C/D, 10% solution; 1.35032 at 17.5 °C/D, 20% solution; 1.35846 at 17.5 °C/D, 30% solution /Phosphoric acid solutions/ |
5. Supplier Suggestions
| Supplier | Website | Location |
|---|---|---|
| Sigma Aldrich/Merck | Visit Merck | International |
| Lennox | Visit Lennox | Ireland |
| Doc Solder | Visit Doc Solder | Ireland |
6. GHS Safety & Hazards
Signal Word
Danger
Danger
Hazard Statements
- H290 (18%): May be corrosive to metals [Warning Corrosive to Metals]
- H302 (15.1%): Harmful if swallowed [Warning Acute toxicity, oral]
- H302: Harmful if swallowed [Warning Acute toxicity, oral]
- H313: May be harmful in contact with skin [Warning Acute toxicity, dermal]
- H314 (99.9%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
- H314: Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]
- H318 (18.2%): Causes serious eye damage [Danger Serious eye damage/eye irritation]
- H318: Causes serious eye damage [Danger Serious eye damage/eye irritation]
- H331: Toxic if inhaled [Danger Acute toxicity, inhalation]
- H332: Harmful if inhaled [Warning Acute toxicity, inhalation]
- H335: May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]
- H370: Causes damage to organs [Danger Specific target organ toxicity, single exposure]
- H402: Harmful to aquatic life [Hazardous to the aquatic environment, acute hazard]
Precautionary Statements
- P234, P260, P264, P264+P265, P270, P280, P301+P317, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P330, P363, P390, P405, P406, and P501 (click each P-code to see the statement)
- P260, P261, P264, P264+P265, P270, P271, P273, P280, P301+P317, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P308+P316, P316, P317, P321, P330, P363, P403+P233, P405, and P501 (click each P-code to see the statement)
- P260, P261, P264, P264+P265, P270, P271, P280, P301+P317, P301+P330+P331, P302+P317, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P319, P321, P330, P363, P403+P233, P405, and P501 (click each P-code to see the statement)
- P260, P261, P264, P271, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P363, P405, and P501 (click each P-code to see the statement)
- P260, P264, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P321, P363, P405, and P501 (click each P-code to see the statement)