The basic purpose formulation buffer, the determination of arsenic, antimony, phosphorus, aluminum and iron, phosphorus standard solution preparation, preparation of haploid breeding with various media, serum inorganic phosphorus, alkaline acid enzyme activity, serum test preparation bacterial hook leptospirosis medium like. Industrial uses industry as a buffer, cultivate agent; also used as an agent for the synthesis of the bacterial culture spill clean flavors, potassium metaphosphate manufactured materials, brewing yeast culture agent, fortifier, leavening agents, fermentation additives. Potassium dihydrogen phosphate, is a colorless tetragonal crystal or white crystalline powder. The relative density of 2.338. Melting point 252.6 ℃. Soluble in water, 90 ℃, the solubility of 83.5g / 100ml water, acidic aqueous solution, pH 1% solution of potassium dihydrogen phosphate is 4.6. Insoluble in alcohol. Deliquescence. Melts when heated to 400 ℃ made transparent liquid, solidified after cooling opaque glassy potassium metaphosphate.