What is sodium pyrophosphate?

Also known as: tetrasodium phosphate; Anhydrous sodium pyrophosphate;

Molecular formula Na4P2O7
Molecular weight 265.90
CAS No.: 13472 - 36 - 1
[ Sodium pyrophosphate - Physical and Chemical Properties ]
White powder or crystal. Relative density 2.534, melting point 880 ℃, boiling point 93.8 ℃, specific gravity 2.534. Colorless transparent crystal or white crystal powder. Soluble in water, the solubility in 100g of water at 20 ℃ is 6.23, and its aqueous solution is alkaline. Insoluble in alcohol. The aqueous solution is still stable below 70 ℃, and will hydrolyze to disodium hydrogen phosphate upon boiling. Weathering in dry air, losing crystal water at 100 ℃. It is easy to absorb moisture in the air and deliquesce. Can form complexes with alkaline earth metal ions; White silver pyrophosphate is generated when meeting Ag+.
[ sodium pyrophosphate - preparation method ]
Anhydrous sodium pyrophosphate is prepared by melting and dehydrating disodium hydrogen phosphate, dissolving in water and crystallizing.
[ Sodium Phosphate - Use ]
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. The paper industry is used for bleaching paper and plant fibers. The printing and dyeing industry is used as an assistant in printing and dyeing and fine bleaching. The daily chemical industry is used as a toothpaste additive, can form colloid with calcium hydrogen phosphate and play a stabilizing role, and can also be used for synthesizing detergents and producing shampoo paste and other products. Used as water softener in water treatment. Used as rust remover in mechanical processing. Used as dispersant and emulsifier in chemical production.
[ Safety Terms ]
S26In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
After contact with eyes, please rinse immediately with plenty of clear water and consult a doctor. Wear appropriate protective clothing.