Calcium pyrophosphate
Names | |
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IUPAC name
Calcium diphosphate
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Other names
Diphosphoric acid, calcium salt (1:2)
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.029.292 |
E number | E450(vi) (thickeners, ...) |
MeSH | Calcium+pyrophosphate |
PubChem CID
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UNII | |
CompTox Dashboard (EPA)
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Properties | |
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) |
insoluble | |
Solubility | soluble in HCl, nitric acids |
Refractive index (nD)
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1.585 |
Hazards | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Related compounds | |
Other anions
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Calcium phosphate |
Other cations
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Magnesium pyrophosphate Sodium pyrophosphate |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.
Deposition of CPPD in articular joints causes an arthritis condition called pseudogout.
See also
Calcium pyrophosphate crystals deposited in the cartilage is responsible for the severe joint pain in cases of pseudogout whose symtoms are similar to those of gout. Pseudogout is not related to diet. In the case of gout, which is associated with diet,the pain is caused by the needle-like uric acid crystals in the joint.