Monobasic Calcium Phosphate or Monocalcium Phosphate FCC Food Grade Specifications
Monocalcium Phosphate; Calcium Biphosphate; Acid Calcium Phosphate
Ca(H2PO4)2 Formula weight, anhydrous 234.05
Ca(H2PO4)2-H2O Formula wt, monohydrate 252.07
CAS: anhydrous 7758-23-8
INS: 341(i) CAS: monohydrate 10031-30-8

DESCRIPTION
Calcium Phosphate, Monobasic, occurs as white crystals or granules or as a granular powder. It is anhydrous or contains one molecule of water of hydration, but because of its deliquescent nature, more than the calculated amount of water may be present. It is sparingly soluble in water and is insoluble in alcohol.
Function: Buffer; dough conditioner; firming agent; leavening agent; nutrient; yeast food; sequestrant.

REQUIREMENTS
Labeling: Indicate the state of hydration.

Identification:
A. Dissolve 100 mg of sample by warming it in a mixture of 2 mL of 2.7 N hydrochloric acid and 8 mL of water. Add 5 mL of ammonium oxalate. A white precipitate forms.
B. Add ammonium molybdate TS to a warm solution of sample in a slight excess of nitric acid. A yellow precipitate of ammonium phosphomolybdate forms.
Assay: Anhydrous: Not less than 16.8% and not more than 18.3% of Ca; Monohydrate: Not less than 15.9% and not more than 17.7% of Ca.
Arsenic: Not more than 3 mg/kg.
Fluoride: Not more than 0.005%.
Lead: Not more than 2 mg/kg.
Loss on Drying: Monohydrate: Not more than 1%.
Loss on Ignition Anhydrous: Between 14.0% and 15.5%.