The chemical formula of sodium dihydrogen phosphate is NaH 2 PO 4 -2H 2 O and NaH 2 PO 4 . Relative molecular mass is 156.01 and 119.98. colorless crystal or white crystalline powder. Soluble in water, almost insoluble in ethanol, its aqueous solution is acidic.

Sodium dihydrogen phosphate, also known as sodium acid phosphate, anhydrous and dihydrate, dihydrate is colorless to white crystals or crystalline powder, anhydrous is white powder or particles. Easily soluble in water, almost insoluble in ethanol. 100 ℃ loss of water of crystallization after continuing to heat, the generation of acidic sodium pyrophosphate.

Under a certain pH, it is produced by the reaction between sodium carbonate and phosphoric acid or by the reaction between disodium hydrogen phosphate and a certain proportion of phosphoric acid, and it is easy to agglomerate in wet air.

Uses of sodium dihydrogen phosphate: buffer. Water softener. Manufacture of sodium hexametaphosphate and sodium pyrophosphate. Determination of magnesium. Preparation of modified White's medium in haploid breeding.

Used in boiler water treatment, electroplating, tanning, baking powder, fuel additives, detergents, mica Chelsea, acidic retardant, etc., but also the raw material for the production of sodium hexametaphosphate and condensed acid salt.