Potassium persulfate

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White, odorless crystals. Potassium persulfate is used to bleach and de-Size textiles. It is used in photographic solution as a hypo eliminator to remove Sodium thiosulfate from the plates and paper.

Chemical structure

Potassium persulfate.jpg

Synonyms and Related Terms

potassium persulphate (Br.); potassium peroxydisulfate; persulfate of potash; Anthion


  • Strong oxidizing agent.
  • Skin contact causes irritation.
  • Toxic by ingestion.
  • Reacts violently with organics and reducing salts.
  • Releases sulfur dioxide gas with decomposition.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in water. Insoluble in ethanol.

Composition K2S2O8
CAS 7727-21-1
Density 2.477 g/ml
Molecular Weight mol. wt. = 270.32

Resources and Citations

  • G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 163
  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 7825
  • Photographic chemicals: www.jetcity.com/~mrjones/chemdesc.htm

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