English name: sodium pyrophosphate; Tetra-Sodium pyrophosphate decahydrate; TSPP decahydrate; Sodium pyrophosphate decahydrate
Also known as: Sodium phosphate; anhydrous sodium pyrophosphate;
Appearance: white powder or crystal
Chemical formula: Na4P2O7
Molecular weight: 265.9
CAS No.: 7722-88-5
EINECS No.: 231-767-1 H.S CODE: 28353990

Physical and chemical properties

White powder or crystal. The relative density 2.534, melting point 880 ℃, boiling point 938 ℃. Colorless or white crystalline powder. Soluble in water, 20 ℃ when the solubility of water 100g of 6.23, the solution is alkaline; insoluble in alcohol. Aqueous solution is still stable at below 70 ℃, boiling the hydrolysis of disodium hydrogen phosphate. Weathering in dry air, lose crystal water at 100 ℃. Easy to absorb moisture in the air and deliquescence. And alkaline earth metal ions can form complexes; encounter with Ag to generate white silver pyrophosphate.