Dicalcium phosphate
| Dicalcium phosphate | |
|---|---|
 | |
| IUPAC name Calcium hydrogen phosphate dihydrate | |
| Other names Calcium monohydrogen phosphate | |
| Identifiers | |
| CAS number | 7757-93-9  , 7789-77-7 (dihydrate) |
| PubChem | 104805 |
| ChemSpider | 10605753 |
| UNII | L11K75P92J |
| Jmol-3D images | {{#if:[Ca+2].[Ca+2].[O-]P([O-])([O-])=O|Image 1 |
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| Properties | |
| 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 |
| Hazards | |
| EU Index | Not listed |
| NFPA 704 |
 0
1
0
|
| Flash point | Non-flammable |
(verify) (what is: / ?)Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa) | |
| 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. 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
Preparation
Dicalcium phosphate is produced by the reaction of calcium chloride and phosphoric acid:
- CaCl2 + H3PO4 + 2 NaOH → CaHPO4 + H2O + 2 NaCl + 2 H2O
Calcium carbonate is also used in place of the calcium chloride and sodium hydroxide.
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. It is also used in some toothpastes as a tartar control agent.[1]
References
- ↑ 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