Description
The relative density of sodium pyrophosphate is 1.824, and the melting point is 880 ??C. Soluble in water, insoluble in alcohol, its aqueous solution is alkaline, easily weathered, and has moisture absorption. It has a strong pH buffering property and has a certain chelating effect on metal ions. Anhydrous sodium pyrophosphate is mainly used as water softener, printing and dyeing bleaching auxiliaries, wool degreaser, boiler descaling agent, metal ion chelating agent, dispersing agent, auxiliaries for printing and dyeing and fine bleaching of grass products. Synthetic washing additive. Conditioner for oil well mud, auxiliary agent for the production of ABS resin. Used as a complexing agent for copper in electroplating baths. Sodium pyrophosphate decahydrate is mainly used as a toothpaste stabilizer. It is used as emulsifier, buffer, chelating agent, gelling agent and stabilizer in food industry. When sodium pyrophosphate and Ag+ meet, white silver pyrophosphate is formed, while orthophosphate reacts with Ag+ to produce yellow silver orthophosphate precipitate, which is a characteristic reaction that distinguishes the two salts from each other. Edible sodium pyrophosphate has the ability to integrate with metal particles, disperse, flocculate, emulsify, prevent lipid and oxidation, and increase the viscosity of casein. When the Ph value is high, it has the effect of inhibiting food spoilage.