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Monohydrogen phosphate
Phosphoric acid, ion(2-) Hydrophosphoric acid (2-) Biphosphate (2-) Hydrogen phosphate or monohydrogen phosphate (systematic name) is the inorganic ion with the formula [HPO4]2-. Its formula can also be written as [PO3(OH)]2-. Together with dihydrogen phosphate, hydrogenphosphate occurs widely in natural systems. Their salts are used in fertilizers and in cooking. Most hydrogenphosphate salts are colorless, water soluble, and nontoxic.
It is a conjugate acid of phosphate [PO4]3- and a conjugate base of dihydrogen phosphate [H2PO4]−.
It is formed when a pyrophosphate anion reacts with water by hydrolysis, which can give hydrogenphosphate: : + H2O 2
Acid-base equilibria
Hydrogenphosphate is an intermediate in the multistep conversion of phosphoric acid to phosphate:
| Equilibrium | Dissociation constant, p*K*a{{cite journal |
|---|---|
| first1=Kipton J. | first2=Paul L. |
| H3PO4 + H+ | Values are at 25°C and 0 ionic strength.}} |
| + H+ | p*K*a2 = 7.20 |
| + H+ | p*K*a3 = 12.37 |
Examples
- Diammonium phosphate, (NH4)2HPO4
- Disodium phosphate, Na2HPO4, with varying amounts of water of hydration
References
References
- (2008). "Phosphoric Acid and Phosphates".
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