Dipotassium phosphate sample and original bottle
| IUPAC names
| Systematic IUPAC name
| Other names
Dipotassium hydrogen orthophosphate
Dipotassium hydrogen phosphate
Dipotassium monohydrogen phosphate
Phosphoric acid dipotassium salt
Potassium phosphate dibasic
Potassium monohydrogen phosphate
|Molar mass||174.2 g/mol|
|Melting point||465 °C (869 °F; 738 K) (decomposes)|
|149.25 g/100 ml (20 °C)|
|Solubility|| Slightly soluble in ethanol, methanol|
Insoluble in ethers, hydrocarbons, halocarbons
|Vapor pressure||~0 mmHg|
|Safety data sheet||Sigma-Aldrich|
| Monopotassium phosphate|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Dipotassium phosphate, also called potassium hydrogen phosphate or potassium phosphate dibasic, is one of the potassium salts of phosphoric acid, with the formula K2HPO4.
Dipotassium phosphate is a colorless crystalline solid, soluble in water, but less so in alcohols. It is odorless.
Dipotassium phosphate is sold in agricultural stores as fertilizer.
Can also be purchased from chemical suppliers.
- 2 KOH + H3PO4 → K2HPO4 + H2O
- KOH + KH2PO4 → K2HPO4 + H2O
The pH of the final solution is tested, to see if the compound has been obtained.
- Buffering agent
- Make tripotassium phosphate
Dipotassium phosphate has low toxicity and doesn't require special handling.
Potassium phosphate dibasic should be kept in closed bottles.
No special disposal is required, discard it as you wish.