Potassium oxalate

Jump to navigation Jump to search


Transparent, odorless crystals. Potassium oxalate is used as a water soluble source of oxalate for removing of rust stains and iron gall inks. It is also used as a cleaner for metals and wood, as a mordant in dyeing and as a photographic chemical.

Synonyms and Related Terms

oxalate of potash


  • Toxic by ingestion and inhalation.
  • Skin contact may cause irritation.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

Soluble in water. Insoluble in ethanol. Decomposes when heated to form potassium carbonate.

Composition K2C2O4 - H2O
CAS 6487-48-5
Density 2.08 g/ml
Molecular Weight mol. wt. = 166.22

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 7820
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • Photographic chemicals: www.jetcity.com/~mrjones/chemdesc.htm