Calcium pyrophosphate

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Calcium pyrophosphate
Calcium pyrophosphate.png
CAS number 7790-76-3 YesY
PubChem 24632
ChemSpider 23034 YesY
UNII X69NU20D19 YesY
MeSH Calcium+pyrophosphate
ChEBI CHEBI:32598 YesY
Jmol-3D images Image 1
Molecular formula Ca2O7P2
Molar mass 254.053 g/mol
Appearance White powder
Density 3.09 g/cm3
Melting point 1,353 °C (2,467 °F; 1,626 K)
Solubility in water insoluble
Solubility soluble in HCl, nitric acids
Refractive index (nD) 1.585
EU Index Not listed
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 2: Intense or continued but not chronic exposure could cause temporary incapacitation or possible residual injury. E.g., chloroform Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Flash point Non-flammable
Related compounds
Other anions Calcium phosphate
Other cations Magnesium pyrophosphate
Sodium pyrophosphate
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Calcium pyrophosphate (Ca2P2O7) is a chemical compound that can be formed by the reaction of pyrophosphoric acid and a calcium base or by strongly heating calcium phosphate or calcium ammonium phosphate.

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

Calcium pyrophosphate crystals deposited in cartilage are responsible for the severe joint pain in cases of calcium pyrophosphate deposition disease (pseudo gout) whose symptoms are similar to those of gout.[1]