Potassium bromide

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Colorless crystals or white powder. Potassium bromide is used in photography in gelatin bromide papers and in developing and intensifying baths. It is also used in process engraving and lithography. For infrared spectroscopy, potassium bromide is used to make IR transparent salt pellets.

Synonyms and Related Terms

tripotassium tribromide


  • Toxic by ingestion or inhalation of large amounts.
  • Skin contact may cause irritation.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in water, glycerol. Slightly soluble in ethanol, ether.

Composition KBr
CAS 7758-02-3
Melting Point 730 C
Density 2.75 g/ml
Molecular Weight mol. wt. = 119.0
Boiling Point 1435 C

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7780
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Photographic chemicals: www.jetcity.com/~mrjones/chemdesc.htm