H₃PO₄H3PO497.9940 g·mol⁻¹
Molar mass97.994 g·mol⁻¹calc 97.994 • Atomic weights: CIAAW 2021 (conventional atomic weights)
FormulaH₃PO₄H3PO4
Classacid • covalentliquid
| Element | Count | Mass (g/mol) | Mass % |
|---|---|---|---|
| H | 3 | 3.024 | 3.09% |
| P | 1 | 30.974 | 31.61% |
| O | 4 | 63.996 | 65.31% |
Physical properties
- State at STP
- liquid
- Density
- 1.88 g·cm⁻³ (liquid (100%) at 20 °C, 1 atm)
- Melting point
- 315.15 K (1 atm)
- Boiling point
- 431 K (decomposes)
Structure & bonding
Tetrahedral PO4 with three OH and one P=O. Triprotic weak-to-moderate acid.
Occurrence & preparation
Wet process: phosphate rock + H2SO4.
Uses
- Fertilizer
- Food acid (regulated)
Safety
Corrosive; causes burns.
Consult current SDS. — consult current SDS before handling.