The chemical formula is NaH2PO4, which is an inorganic acid salt that is easily soluble in water and almost insoluble in ethanol. Sodium dihydrogen phosphate is the raw material of sodium hexametaphosphate and sodium pyrophosphate. It is mainly used in tanning, boiler water treatment, as quality improver and baking powder, and as buffer and raw material of fermentation powder in food industry and fermentation industry. It is also used as feed additive, detergent and dyeing agent, etc.