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Disodium pytophosphate CAS 7758-16-9


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  • 7758-16-9

Disodium pytophosphate Basic information
Product Name: Disodium pytophosphate
CAS: 7758-16-9
MF: H2Na2O7P2
MW: 221.94
EINECS: 231-835-0
Product Categories: Food Additives;Inorganics
Mol File: 7758-16-9.mol
Disodium pytophosphate Chemical Properties
Melting point decomposes 220℃ [MER06]
density (hexahydrate) 1.86
storage temp. −70°C
solubility H2O: 0.1 M at 20 °C, clear, colorless
form white powder
PH 3.5-4.5 (20℃, 0.1M in H2O, freshly prepared)
Water Solubility Fully miscible in water. Insoluble in alcohol and ammonia.
λmax λ: 260 nm Amax: 0.11

λ: 280 nm Amax: 0.09
Merck 138643
Stability: Stable.

Test Items Specification
Appearance White powder or grains
Assay (Na2H2P2O7),% 95.0 min
Water insoluble,% 1.0 max
PH value (1% solution) 3.7-4.4
Loss on drying,% 0.5 max
Arsenic, ppm 2 max
Fluoride, ppm 30 max
Heavy metal 10 max
Pb, ppm 4 max
Cd, ppm 1 max
Hg, ppm 1 max
Bulk density, g/l 800-1150
Ror 26-30




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