Pyrophosphoric acid

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Pyrophosphoric acid
Chemical name	Diphosphoric acid
Chemical formula	H4O7P2
Molecular mass	177.98 g/mol
Melting point	61 °C
Boiling point	? °C
Density	? g/cm3
CAS number	2466-09-3
SMILES	OP(OP(O)(O)=O)(O)=O

Pyrophosphoric acid, also known under the name diphosphoric acid, is a syrupy liquid or a needle-like crystaline solid. Pyrophosphoric acid is colorless, odorless, hygroscopic and is soluble in water, diethyl ether, and ethyl alcohol. It is the anhydride of phosphoric acid and is produced from phosphoric acid by dehydration. Pyrophosphoric acid is a medium strong inorganic acid. The anion, the salts, and the esters of pyrophosphoric acid are called pyrophosphates. Pyrophosphoric acid slowly hydrolyzes in the presence of water into phosphoric acid.

See also

• Sodium pyrophosphate
• Calcium pyrophosphate dihydrate deposition disease
• Dimethylallyl pyrophosphate
• ATPja:ピロリン酸

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