|This article does not cite any references or sources. (December 2009)|
|Jmol-3D images||Image 1|
|Molar mass||254.053 g/mol|
|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|
|Other anions||Calcium phosphate|
|Other cations||Magnesium pyrophosphate
| (what is: / ?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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.
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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.