Potassium chloride

Jump to navigation Jump to search


White crystals that occur in nature as the mineral sylvite. Potassium chloride is used in photography, spectroscopy, as a table salt substitute and as an ice melting salt.

Synonyms and Related Terms

potassium monochloride; chloropotassuril; febrifuge of Sylicius; muriate of potass


  • Noncombustible.
  • Toxic by ingestion of large amounts.
  • Millipore Sigma: SDS

Physical and Chemical Properties

Soluble in water (pH is about 7 with saturated solution). Slightly soluble in ethanol. Insoluble in ether, acetone.

Composition KCl
CAS 7447-40-7
Melting Point 773 C
Density 1.987 g/ml
Molecular Weight mol. wt. = 74.55
Boiling Point 1500 C (sublimes)

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 631
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7783
  • Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985