Dicalcium phosphate

The "di" prefix in the common name arises because the formation of the HPO42– anion involves the removal of two protons from phosphoric acid, H3PO4.

Dicalcium phosphate is used as a food additive, it is found in some toothpastes as a polishing agent and is a biomaterial.

At 60 °C the anhydrous form is precipitated:[3] To prevent degradation that would form hydroxyapatite, sodium pyrophosphate or trimagnesium phosphate octahydrate are added when for example, dibasic calcium phosphate dihydrate is to be used as a polishing agent in toothpaste.

Dibasic calcium 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.

NFPA 704 four-colored diamond Health 1: Exposure would cause irritation but only minor residual injury. E.g. turpentine Flammability 0: Will not burn. E.g. water Instability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogen Special hazards (white): no code
Portion of the lattice of dicalcium phosphate dihydrate, highlighting the 8-coordinated Ca 2+ center and the location the protons on three ligands (green = calcium, red = oxygen, orange = phosphorus, white = hydrogen)