Potassium dihydrogen phosphate is a chemical with the chemical formula of KH₂PO₄ and molecular weight of 136.09. It is a colorless crystalline or white granular powder. The CAS No. of potassium dihydrogen phosphate is 7778-77-0, the melting point is 257.6 ℃, the water solubility is 22.6g/100mL, the density is 2.238 g/cm³, and it has deliquescence. When heated to 400 ℃, it melts into a transparent liquid and solidifies into opaque glassy potassium metaphosphate after cooling. Stable in air and soluble in. It is used as buffer and culture agent in industry; It is also used as a flavoring agent for the synthesis of sake by bacterial culture agent, as well as a culture agent, strengthening agent, leavening agent and fermentation assistant for brewing yeast. It is used as high efficient phosphorus and potassium compound fertilizer in agriculture.