Monohydrogen phosphate
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Through Water and Hydrolysis
It is a conjugate acid of phosphate [PO4]3- and a conjugate base of dihydrogen phosphate [H2PO4]−.
It is formed when a pyrophosphate anion [P
2O
7]4−
reacts with water H
2O by hydrolysis, which can give hydrogenphosphate:
- [P
2O
7]4−
+ H2O ⇌ 2 [HPO
4]2−
Acid-base equilibria
Hydrogenphosphate is an intermediate in the multistep conversion of phosphoric acid to phosphate:
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Examples
- Diammonium phosphate, (NH4)2HPO4
- Disodium phosphate, Na2HPO4, with varying amounts of water of hydration