Sodium pyrophosphate, molecular Na4P2O7·10H2O, relative molecular weight 446.07. Also known as tetrasodium bisphosphate, there is no water and ten water. The aqueous substance is colorless or white crystalline or crystalline powder, anhydrous substance is white powder, soluble in water, insoluble in ethanol and other organic solvents. It has strong complexing ability with metal ions such as Cu2+, Fe meter and Mn2+, and the aqueous solution is stable below 70℃. After boiling, it is hydrolyzed into disodium hydrogen phosphate.
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