Dicalcium phosphate

Dicalcium phosphate
CAS number 7757-93-9 YesY
7789-77-7 (dihydrate)
PubChem 104805
ChemSpider 10605753 YesY
UNII L11K75P92J YesY
Jmol-3D images Image 1
Molecular formula CaHPO4
Molar mass 136.06 g/mol
Appearance white powder
Density 2.929 g/cm3
Solubility in water 0.02 g/100 mL
EU Index Not listed
NFPA 704
NFPA 704.svg
Flash point Non-flammable
 YesY phosphate (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Dicalcium phosphate, also known as calcium monohydrogen phosphate, is a dibasic calcium phosphate. It is usually found as the dihydrate, with the chemical formula of CaHPO4 • 2H2O, but it can be thermally converted to the anhydrous form. It is practically insoluble in water, with a solubility of 0.02 g per 100 mL at 25 °C. It contains about 29.5 percent calcium in its anhydrous form.


Dicalcium phosphate may be formed by the reaction of stoichiometric quantities of calcium oxide and phosphoric acid:

CaO + H3PO4 → CaHPO4 + H2O.


Dicalcium phosphate is mainly used as a dietary supplement in prepared breakfast cereals, dog treats, enriched flour, and noodle products. It is also used as a tableting agent in some pharmaceutical preparations, including some products meant to eliminate body odor. It is used in poultry feed. It is also used in some toothpastes as a tarter control agent.

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