TSPP is made through a neutralization process using phosphoric acid and sodium hydroxide in a 2:1 molar ratio. TSPP exists in two food grade forms, the anhydrous form with the chemical formula Na4P2O7 and the decahydrate form with the chemical formula Na4P2O7 · 10H2O. TSPP is a white or granular powder that is soluble in water but insoluble in ethanol.
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1. How is TSPP made?
TSPP can be produced by the neutralization of phosphoric acid with sodium hydroxide with
mol proportions of 2:1.
Food grade TSPP exists as two forms, and follows the corresponding chemical formula:
TSPP Anhydrous: Na4P2O7
TSPP Decahydrate: Na4P2O7 · 10H2O
Specification
Other names
Tetrasodium disphosphate
Tetrasodium phosphate
Sodium pyrophosphate
CAS number 7722-88-5
Appearance white powder or granular powder
Solubility Soluble in water, insoluble in ethanol
