Calcium pyrophosphate
IUPAC name	Calcium diphosphate
Other names	Diphosphoric acid, calcium salt (1:2)
Identifiers
CAS number	7790-76-3 Y
PubChem	24632
MeSH	Calcium+pyrophosphate
SMILES	[Ca+2].[Ca+2].[O-]P([O-])(=O)OP([O-])([O-])=O
InChI	1/2Ca.H4O7P2/c;;1-8(2,3)7-9(4,5)6/h;;(H2,1,2,3)(H2,4,5,6)/q2*+2;/p-4
InChI key	JUNWLZAGQLJVLR-XBHQNQODAN
ChemSpider ID	23034
Properties
Molecular formula	Ca2O7P2
Molar mass	254.053 g/mol
Density	3.09 g/cm3
Melting point	1230 °C
Solubility in water	insoluble
Hazards
EU Index	Not listed
NFPA 704	0 2 0
Flash point	Non-flammable
Related compounds
Other anions	Calcium phosphate
Other cations	Magnesium pyrophosphate Sodium pyrophosphate
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

Calcium pyrophosphate (Ca₂O₇P₂) is a chemical compound that can be formed by the reaction of pyrophosphoric acid and a calcium base or by strongly heating calcium hydrogen orthophosphate or calcium ammonium orthophosphate.

It is commonly used as a mild abrasive agent in toothpastes.

Deposition of CPPD in articular joints causes an arthritis condition called pseudogout.

[edit] See also

• Calcium pyrophosphate deposition disease

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