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Topic summary

Monohydrogen phosphate

Monohydrogen phosphate
Names 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)
ChEBI
ChemSpider
1998
UNII
  • InChI=1S/H3O4P/c1-5(2,3)4/h(H3,1,2,3,4)/p-2
    Key: NBIIXXVUZAFLBC-UHFFFAOYSA-L
  • OP(=O)([O-])[O-]
Properties HPO
4Conjugate acidDihydrogen phosphateConjugate basePhosphate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Hydrogen phosphate or monohydrogen phosphate(systematic name) is the inorganic ion with the formula [HPO4]. Its formula can also be written as [PO3(OH)]. 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] and a conjugate base of dihydrogen phosphate [H2PO4].

It is formed when a pyrophosphate anion [P
2O
7]
 reacts with waterH
2O by hydrolysis, which can give hydrogenphosphate:

[P
2O
7]
 + H2O ⇌ 2 [HPO
4]
Wikipedia source