Dicalcium phosphate

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Dicalcium phosphate
Dicalcium phosphate.png
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
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine 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
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

Dicalcium phosphate, also known as dibasic calcium phosphate or calcium monohydrogen phosphate, is a type of calcium phosphate that is dibasic. It is usually found as the dihydrate, with the chemical formula of CaHPO4•2H2O, but it can be thermally converted to the anhydrous form, which has been referred to by the abbreviation 'DPCA'.[1] 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. On contact with water, it converts to hydroxyapatite, which is insoluble solid, and phosphoric acid.


Dicalcium phosphate is produced by the reaction of calcium chloride and phosphoric acid:

CaCl2 + H3PO4 + 2 NaOH → CaHPO4 + 2 NaCl + 2 H2O

Calcium carbonate is also used in place of the calcium chloride and sodium hydroxide.


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. Dicalcium phosphate is also found in some dietary calcium supplements (e.g. Bonexcin). It is used in poultry feed. It is also used in some toothpastes as a tartar control agent.[2]


  1. ^ Liu, Xue et al. (March 2013). "Fluidized Bed Drying of Pharmaceutical Materials: Moisture Measurement and Effects of Particle Size". Am. Pharm. Rev.: 32. ISSN 1099-8012. 
  2. ^ Klaus Schrödter, Gerhard Bettermann, Thomas Staffel, Friedrich Wahl, Thomas Klein, Thomas Hofmann "Phosphoric Acid and Phosphates" in Ullmann’s Encyclopedia of Industrial Chemistry 2008, Wiley-VCH, Weinheim. doi:10.1002/14356007.a19_465.pub3

See also[edit]