Potassium phosphate

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White granular crystals. Potassium phosphate monobasic is used as a buffering agent.

Chemical structure

Potassium phosphate.jpg

Synonyms and Related Terms

potassium phosphate monobasic; potassium dihydrogen phosphate


  • Contact or inhalation may cause irritation.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water. pH = 4.4-4.7

Composition KH2PO4
CAS 7778-77-0
Melting Point 253 C
Density 2.34 g/ml
Molecular Weight mol. wt. = 136.09
Boiling Point 400 C (dec)

Resources and Citations

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7542
  • Richard C. Wolbers, Nanette T. Sterman, Chris Stavroudis, Notes for Workshop on New Methods in the Cleaning of Paintings, J.Paul Getty Trust, Los Angeles, 1990