Dicalcium phosphate

Dicalcium phosphate
IUPAC name Calcium hydrogenphosphate
Other names Calcium monohydrogen phosphate Phosphoric acid, calcium salt (1:1)
Identifiers
CAS number	7757-93-9 Y,  7789-77-7 (dihydrate)
PubChem	104805
ChemSpider	10605753 Y
UNII	L11K75P92J Y
SMILES [Ca+2].[Ca+2].[O-]P([O-])([O-])=O
InChI InChI=1S/2Ca.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+2;/p-3 Y Key: NEFBYIFKOOEVPA-UHFFFAOYSA-K Y InChI=1/2Ca.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+2;/p-3 Key: NEFBYIFKOOEVPA-DFZHHIFOAL
Properties
Molecular formula	CaHPO4
Molar mass	136.06 g/mol
Density	2.929 g/cm3
Solubility in water	0.02 g/100 mL
Hazards
EU Index	Not listed
NFPA 704	0 1 0
Flash point	Non-flammable
Related compounds
Other anions	Calcium pyrophosphate
Other cations	Magnesium phosphate Monocalcium phosphate Tricalcium phosphate Strontium phosphate
Y(what is this?)  (verify) 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 anyhydrous form.

[edit] Preparation

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

CaO + H₃PO₄ → CaHPO₄ + H₂O.

[edit] Uses

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.

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