Tricalcium Phosphate
Ca3 (P O4)2
Calcium Phosphate Tribasic

{Merck Index - © 1952 by Merck & Co., Inc.}

Calcium Phosphate - Tribasic: Tricalcium phosphate; tertiary calcium phosphate. The technical product is also known as "bone ash." Ca3(PO4)2; mol. wt. 310.20. Ca 38.76%, CaO 54.24%, P 19.97%, PO4 61.24%, H3PO4 63.19%, P2O5 45.76%. It is about 96% pure, usually containing an excess of CaO.

Amorphous, odorless, tasteless powder. d. 3.14. m. 1670°. Insoluble in water, alcohol or acetic acid; soluble in dil. HCl or HNO3.

Use: Manuf. milk-glass, polishing and dental powders, porcelains, pottery; enameling; clarifying sugar syrups; in animal feeds; as noncaking agent; in the textile industry. Grades available: Reagent, N.F., technical.

Med. Use: Antacid and for calcium replacement. Dose: 1 to 5 g.

Vet. Use: Antacid. As source of calcium, phosphorus.

Calcium Phosphate - Dibasic: Secondary calcium phosphate. CaH(PO4)2 • H2O; mol. wt. 172.10. Anhydr. salt 79.06%, H2O 20.94%, Ca 23.29%, PO4 55.19%, P 18.0%, CaO 32.59%, P2O5 41.24%.

Monoclinic crystals. d. 2.31. Almost insoluble in water; soluble in dil. HCl or HNO3, slightly soluble in dil. acetic acid.

Use: Chiefly in animal feeds; mineral supplement in cereals and other foods; also in dental powders; mfg. glass, fertilizers.

Grades available: Reagent, U.S.P., technical.

Med. Use: Dietary supplement. Dose: 0.5 to 3 g.

Vet. Use: As for calcium phosphate, tribasic.

Calcium Phosphate - Monobasic: Calcium biphosphate; acid calcium phosphate; monocalcium phosphate; primary calcium phosphate; "calcium superphosphate." CaH4(PO4)2 • H2O; mol. wt. 252.09. Anhydr. salt 92.85%, H2O 7.15%, Ca 15.90%, PO4 75.35%, P 24.58%, CaO 22.25%, P2O5 56.31%.

Deliquesc. granules or powder; strong acid taste an reaction. d. 2.20. Partially soluble in water with decomposition, free H3PO4 and the insoluble di- or tri-basic salt formed; soluble in dil. HCl or HNO3, or in acetic acid.

Keep well closed.

Use: With sod. bicarbonate in baking powders; as plant food (for flowers, etc.); mineral supplement for foods and feeds; in enameling.

Grades available: Reagent, technical.

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