Sodium Phosphate, Tribasic
Trisodium Phosphate INS: 339(iii)
Anhydrous :
Molecular Formula : Na3PO4
Molecular Weight : 163.94
CAS: [7601-54-9]
Dodecahydrate :
Molecular Formula : Na3PO4·12H2O
Molecular Weight : 380.12
CAS: [10101-89-0]
DESCRIPTION
Sodium
Phosphate, Tribasic, occurs as white crystals or granules or as a crystalline material. It may be anhydrous or contain 1 to 12 molecules of water of hydration. The formula for a crystalline material is approximately 4(Na3PO4·12H2O)- NaOH. It is freely soluble in water, but is insoluble in alcohol. The pH of a 1:100 aqueous solution is between 11.5 and 12.5.
Function Antimicrobial; buffer;
emulsifier; nutrient.
REQUIREMENTS
Identification A 1:20 aqueous solution gives positive tests for Sodium and for Phosphate, Appendix IIIA.
Assay Anhydrous and Monohydrate: Not less than 97.0% of Na3PO4, calculated on the ignited basis; Dodecahydrate: Not less than 90.0% of Na3PO4, calculated on the ignited basis.
Arsenic Not more than 3 mg/kg.
Fluoride Not more than 0.005%.
Insoluble Substances Not more than 0.2%.
Lead Not more than 4 mg/kg.
Loss on Ignition Anhydrous: Not more than 2.0%; Monohydrate:
Between 8.0% and 11.0%; Dodecahydrate: Between 45.0% and 57.0%.
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