Pyrophosphoric acid

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Pyrophosphoric acid
Chemical structure of pyrophosphoric acid
3D model of pyrophosphoric acid
CAS number 2466-09-3 YesY
PubChem 1023
ChemSpider 996 YesY
ChEBI CHEBI:29888 YesY
Jmol-3D images Image 1
Molecular formula H4P2O7
Molar mass 177.98 g/mol
Melting point 71.5 °C (160.7 °F; 344.6 K)
Solubility in water Extremely soluble
Solubility Very soluble in alcohol, ether
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Pyrophosphoric acid, also known under the name diphosphoric acid, is colorless, odorless, hygroscopic and is soluble in water, diethyl ether, and ethyl alcohol. It is produced from phosphoric acid by dehydration. Pyrophosphoric acid slowly hydrolyzes in the presence of water into phosphoric acid.

H4P2O7 + H2O is in equilibrium with 2H3PO4

Pyrophosphoric acid is a medium strong inorganic acid. Anions, salts, and esters of pyrophosphoric acid are called pyrophosphates.

While pyrophosporic acid is corrosive, it is not known to be otherwise toxic.[1]

See also[edit]


  1. ^ Material Safety Data Sheet: Pyrophosphoric acid MSDS www,

External links[edit]