Sodium dihydrogen phosphate, also known as acidic sodium phosphate, is an inorganic acid salt with chemical formula of NaH2PO4, which is easily soluble in water and almost insoluble in ethanol.

also known as acid sodium phosphate. The molecular formula is NaH2PO4·2H2O and NaH2PO4,The relative molecular mass is 156.01 and 119.98.Divided into anhydrous and dihydrate, dihydrate is colorless to white crystalline or crystalline powder, anhydrous is white powder or particles.Easily soluble in water, almost insoluble in ethanol. After losing the crystallization water at 100°C and continuing to heat, acid sodium pyrophosphate is generated.

Item | NaH4P2O4·2H2O | NaH4P2O4 |
Main contents(NaH4P2O4·2H2O),w/%≥ | 98.0 | 98.0 |
Main contents(NaH4P2O4),w/%≥ | 98.0 | 98.0 |
Water insoluble,w/%≤ | 0.10 | 0.20 |
Iron(Fe),w/%≤ | 0.05 | 0.05 |
(As),w/%≤ | 0.01 | 0.01 |
Sulphate(as SO4),w/%≤ | 0.5 | 0.5 |
Chloride(as CI),w/%≤ | 0.40 | 0.40 |
PH value(10g/L solution) | 4.2-4.6 | 4.2-4.6 |
Fluoride,w/%≤ | 0.05 | 0.05 |
Sodium dihydrogen phosphate is the raw material for producing sodium hexametaphosphate and sodium pyrophosphate, which is mainly used for tanning, treating boiler water, as a quality improver and baking powder, as a buffer and raw material for baking powder in food industry and fermentation industry, and as a feed additive, detergent and dyeing auxiliary.


