Sodium Thiosulfate Pentahydrate [Na2O3S2.5H2O] [CAS_10102-17-7] Photo Grade 99+%, Monoclinic Crystal (50 Lb Bag)

$ 160.00 $ 186.00

Wintersun code: 19-125
CAS Number: 10102-17-7
Molecular Formula: Na2O3S2.5H2O
Molecular Weight: 248.18 g/mol


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: Monoclinic system crystal, colorless transparent 
  • Purity: 99.00% Min
  • Insoluble Substance in Water: 0.01% Max
  • Sulfide: 0.001% Max
  • Fe: 0.001% Max
  • pH: 6.5~9.5
  • Particle Size/ GRAM: 12~16


50 lb paper bag

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