Monohydrogen phosphate
Chemical compound / From Wikipedia, the free encyclopedia
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.[1] Most hydrogenphosphate salts are colorless, water soluble, and nontoxic.
Quick Facts Names, Identifiers ...
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Names | |||
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Preferred IUPAC name
Hydrogenphosphate | |||
Systematic IUPAC name
Monohydrogenphosphate Phosphoric acid, ion(2-) | |||
Other names
Phosphoric acid, ion(2-) Hydrophosphoric acid (2-) Biphosphate (2-) | |||
Identifiers | |||
3D model (JSmol) |
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ChEBI | |||
ChemSpider | |||
1998 | |||
PubChem CID |
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UNII | |||
CompTox Dashboard (EPA) |
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Properties | |||
HPO2− 4 | |||
Conjugate acid | Dihydrogen phosphate | ||
Conjugate base | Phosphate | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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−