Application: Mainly used as a supplement of phosphorus and nitrogen in animal feed.

Properties: Appearance is white granular crystal, easily soluble in water, insoluble in organic solvent. The melting point is 117.3 ° C, and the aqueous solution is strongly acidic.

Properties: White crystal or powder, easily soluble in water, insoluble in ethanol, slightly soluble in chloroform.

Properties: Colorless transparent crystal, stable in air, soluble in water (22.6g/100ml), insoluble in ethanol, deliquescence. When heated to 400 ℃, it melts into a transparent liquid, and after cooling, it solidifies into an opaque glassy potassium metaphosphate.

Properties: Appearance is white crystal or amorphous white powder, easily soluble in water, slightly alkaline in aqueous solution, slightly soluble in alcohol, hygroscopic, self-dissolving at high temperature. Anhydrous dipotassium hydrogen phosphate is converted into potassium pyrophosphate when heated to 204°C.