Sodium Thiosulfate Anhydrous [Na2S2O3] [CAS_7772-98-7] 97+% White Powder (50 Lb Bag)

$ 175.00 $ 214.00

Wintersun code: 19-051
CAS Number: 7772-98-7
Molecular Formula: Na2O3S2
Molecular Weight: 158.11

Sales Specification

  • Physical State: White crystals or powder
  • Melting Point: 43 °C
  • Specific Gravity: 1.667
  • Solubility in Water: Soluble (33%)
  • PH: 6.5-8
  • NFPA Ratings: Health: 2; Flammability: 0; Reactivity:0
  • Stability: Stable under ordinary conditions. Hygroscopic.


Sodium Thiosulfate is a white translucent crystals or powder that is common as the pentahydrate form; melting at 48 C; readily soluble in water and oil of turpentine; aqueous solution is slightly alkaline which decompose to sulfate and sulfide in the air. It is a moderate reducing agent. It is a source of thiosulfate ion (S2O3-2) (dissolves silver salts). Its major use is as a fixing agent in photography for developing film and the extracting silver from ore. It is used in chrome-tanning leather and in chemical manufacture as a source of sulfide ion. It is also used in paper, textile, and water treatment industry and gas purification.

Sales Specification

  • Appearance: White powder
  • Sodium thiosulfate: 97.0% Min
  • Insoluble substance in water: 0.03% Max
  • Sulfuret (As S): 0.001% Max
  • Ferrum (As Fe): 0.005% Max


50 lb paper bag

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