pyrophosphoric acid

Pyrophosphoric acid
IUPAC name	Diphosphoric acid μ-oxido-bis(dihydroxidooxidophosphorus)
Other names	Diphosphoric acid
Identifiers
CAS number	2466-09-3 Y
SMILES	OP(=O)(O)OP(=O)(O)O
ChemSpider ID	996
Properties
Molecular formula	H4P2O7
Molar mass	177.98 g/mol
Melting point	71.5 °C
Solubility in water	Extremely soluble
Solubility	Very soluble in alcohol, ether
Y (what is this?)  (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Pyrophosphoric acid, also known under the name diphosphoric acid, is a syrupy liquid or a viscous off-white solid.^[1] Pyrophosphoric 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

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

See also

• Sodium pyrophosphate
• Calcium pyrophosphate dihydrate deposition disease
• Dimethylallyl pyrophosphate
• ADP
• ATP
• Ortho acids

References

1. ^ Material Safety Data Sheet: Pyrophosphoric acid MSDS

External links

• Pyrophosphoric acid at PubChem