Mono Potassium Phosphate

Potassium dihydrogen phosphate is a potassium salt in which dihydrogen phosphate(1-) is the counterion. It is a potassium salt and an inorganic phosphate. Monopotassium phosphate, MKP, (also potassium dihydrogenphosphate, KDP, or monobasic potassium phosphate), KH2PO4, is a soluble salt of potassium and the dihydrogen phosphate ion. It is a source of phosphorus and potassium as well as a buffering agent. It can be used in fertilizer mixtures to reduce escape of ammonia by keeping pH low.


Molar Weight136.086 g/mol
Melting Point253 °C
Density2.34 g/cc
FormsCrystals (large), Powder (dry), White, Granular, Red-brown, Pellets

Uses and Applications

Key applications

  • Baking
  • Nutritional supplements
  • Water treatment
  • Adhesives and Sealants
  • Agricultural
  • Cosmetic products
  • Anti-ageing products


  • Pharma
  • Coatings & Construction
  • Cosmetics
  • Food

Synonyms: Potassium dihydrogen phosphate, Potassium phosphate monobasic, Monobasic potassium phosphate, Potassium acid phosphate, Potassium dihydrogen orthophosphate, Monopotassium monophosphate, Monopotassium orthophosphate, potassium dihydrogenphosphate

Chemical Formula: KH2PO4

CAS Number: 7778-77-0