Physical and chemical properties of Sodium pyrophosphate CAS 7722-88-5
White powder or crystal. The relative density is 2.534, and the melting point is 980 ℃. Colorless transparent crystal or white crystalline powder. Easily soluble in water, the solubility of 100g water at 20 ℃ is 6.23g, and its aqueous solution is alkaline; Insoluble in alcohol. The aqueous solution is stable below 70 ℃, and hydrolyzes to disodium hydrogen phosphate when boiling. It is easy to absorb moisture and deliquescence in the air. It can form complex with alkaline earth metal ions; When it meets Ag+, it generates white silver pyrophosphate.
Application
Electroplating industry is used to prepare electroplating solution, which can form complex with iron. Wool spinning industry is used as wool degreaser and bleaching agent. Paper industry is used for bleaching of paper and plant fiber. The printing and dyeing industry is used as an auxiliary in printing, dyeing and fine bleaching. The daily chemical industry is used as toothpaste additive, which can form colloid with calcium hydrogen phosphate and play a stabilizing role. It can also be used to synthesize detergents and produce shampoo and other products. It is used as water softener in water treatment. Used as rust remover in machining. It is used as dispersant and emulsifier in chemical production. It can also be used as water treatment agent, oil drilling, etc., as quality improver, emulsifier, buffer, chelating agent, etc. in the food industry.
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