Pyrophosphoric acid, also known as diphosphoric acid, is the inorganic compound with the formula H4P2O7 or, more descriptively, [(HO)2P(O)]2O. Colorless and odorless, it is soluble in water, diethyl ether, and ethyl alcohol. The anhydrous acid crystallizes in two polymorphs, which melt at 54.3 °C and 71.5 °C. The compound is not particularly useful, except that it is a component of polyphosphoric acid and the conjugate acid of the pyrophosphate anion. Anions, salts, and esters of pyrophosphoric acid are called pyrophosphates.
https://en.wikipedia.org/wiki/Pyrophosphoric_acid
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| Names | |
|---|---|
| IUPAC names Diphosphoric acid μ-oxido-bis(dihydroxidooxidophosphorus) | |
| Other names Diphosphoric acid |
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