Ammonium thiosulfate

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A white crystalline solid that is used as a photographic fixing agent. Ammonium thiosulfate is also used as a Fungicide, a metal lubricant, and an analytical reagent. It acts as a reducing agent that is effective for cleaning metals and alloys containing Tin, Zinc, Lead, or Silver.

Synonyms and Related Terms

ammonium thiosulphate (Br.)


  • Contact may cause irritation.
  • Noncombustible.
  • Plant Food: SDS

Physical and Chemical Properties

Soluble in water. Insoluble in ethanol.

Composition (NH4)2S2O3
CAS 7783-18-8
Melting Point 150 C (dec)
Density 1.32 g/ml
Molecular Weight mol. wt. = 148.21

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 598

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