Sodium pyrophosphate CAS 7722-88-5 is an inorganic compound with the chemical formula Na4P2O7. It is a white crystalline powder that easily absorbs water and deliquests in the air. It is soluble in water but insoluble in ethanol and other organic solvents. It has strong complexing ability with metal ions such as Cu2+, Fe3+, Mn2+, and is stable in aqueous solutions below 70 ℃. When boiled, it hydrolyzes into disodium hydrogen phosphate

Chinese name: Sodium pyrophosphate

Foreign name: sodium diphosphate

Nickname: Tetrasodium diphosphate

Chemical formula: Na4P2O7

Molecular weight: 265.902

CAS login number: 7722-88-5

EINECS login number: 231-767-1

Melting point: 980 ℃

Water solubility: easily soluble

Density: 2.534 g/cm ³

Appearance: White crystalline powder

Physical and chemical properties

White powder or crystal. Relative density 2.534, melting point 980 ℃. Colorless transparent crystalline or white crystalline powder. It is easily soluble in water, with a solubility of 6.23g in 100g of water at 20 ℃, and its aqueous solution is alkaline; Insoluble in alcohol. The aqueous solution remains stable below 70 ℃, but when boiled, it hydrolyzes into disodium hydrogen phosphate. It is easy to absorb moisture and deliquescence in the air. It can form complexes with alkaline earth metal ions; When encountering Ag+, white silver pyrophosphate is generated.

It can undergo complex reactions with metal ions. The pH value of its 1% aqueous solution is 10.0-10.2. It has the properties of ordinary polyphosphates, including emulsification, dispersibility, prevention of fat oxidation, improvement of protein binding, and inhibition of food oxidation and fermentation at high pH values.

Purpose

The electroplating industry is used to prepare electroplating solutions, which can form complexes with iron. The wool spinning industry is used as a wool degreaser and bleaching agent. The papermaking industry is used for bleaching paper and plant fibers. The printing and dyeing industry is used as an auxiliary agent for printing, dyeing, and fine bleaching. The daily chemical industry is used as a toothpaste additive, which can form a colloid with calcium hydrogen phosphate and play a stabilizing role. It can also be used for synthesizing detergents and producing products such as shampoo. Used as a water softener in water treatment. Used as a rust remover in mechanical processing. Used as a dispersant and emulsifier in chemical production. It can also be used as a quality improver, emulsifier, buffering agent, chelating agent, etc. in water treatment agents, petroleum drilling, and the food industry.

ChemicalCAS.com offers price quotation and technology support of chemical from China. In the quotation from China factory supplier, we will include price terms, payment, lead time, COA, TDS, MSDS etc. We make sure the reliable purchase source and product quality. If you need to buy chemical from China, please feel free to contact sales@chemicalcas.com