Sodium Pyrophosphate (
Tetrasodium Pyrophosphate)
Other name : Tetrasodium Diphosphate; Tetras odium Pyrophosphate
Anhydrous :
Molecular Formula : Na4P2O7
Molecular Weight : 265.90
CAS: [7722-88-5]
Decahydrate :
Molecular Formula : Na4P2O7·10H2O
Molecular Weight : 446.06
INS: 450(iii)
CAS: [13472-36-1]
DESCRIPTION
Sodium Pyrophosphate occurs as colorless or white crystals or as a white, crystalline or granular powder. It is anhydrous or contains 10 molecules of water of hydration. The decahydrate
effloresces slightly in dry air. It is soluble in water, but is insoluble in alcohol. The pH of a 1:100 aqueous solution is about 10.
Function
emulsifier; buffer; nutrient; sequestrant; texturizer.
REQUIREMENTS
Identification
A 1:20 aqueous solution gives positive tests for Sodium, Appendix IIIA.Dissolve 100 mg of sample in 100 mL of 1.7 N nitric acid. Add 0.5 mL of this solution to 30 mL of quimociac TS. A yellow precipitate does not form. Heat the remaining portion of the sample solution for 10 min at 95°, and then add 0.5 mL of the solution to 30 mL of quimociac TS. A yellow
precipitate forms immediately.
Assay
Not less than 95.0% and not more than 100.5% of Na4P2O7, 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 0.5%; Decahydrate: Between 38.0% and 42.0%.
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Product Categories : Phosphate > Sodium Phosphate
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