|Jmol-3D images||Image 1|
|Molar mass||177.98 g/mol|
|Solubility in water||Extremely soluble|
|Solubility||Very soluble in alcohol, ether|
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
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 2H3PO4
While pyrophosporic acid is corrosive, it is not known to be otherwise toxic.
See also 
- Sodium pyrophosphate
- Calcium pyrophosphate dihydrate deposition disease
- Dimethylallyl pyrophosphate
- Ortho acids
- triphosphoric acid
- Material Safety Data Sheet: Pyrophosphoric acid MSDS www,sciencelab.com