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.)

Other Properties

Soluble in water. Insoluble in ethanol.

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

Hazards and Safety

Contact may cause irritation. Noncombustible.

Eastman Kodak: MSDS 03/05/99

Sources Checked for Data in Record

  • 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