Sodium Thiosulfate, Pentahydrate

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Sodium thiosulfate, 10102-17-7, Na₂S₂O₃ ∙ 5H₂O MW 248.19, sometimes spelled sodium thiosulphate, is also known as hypo crystals. Sodium thiosulfate is colorless, water soluble, crystalline. Sodium thiosulfate is used in photography, papermaking, dechlorination of water, lab reagent, bleaching and in patina recipes to make greens and blues (copper, brass, bronze).

General Information on Sodium thiosulfate

Item No. : S8134-500, S8134-2.5, S8134-12

CAS No. : 10102-17-7

Synonym : Sodium thiosulphate

Properties of Sodium thiosulfate :

Appearance/Form: Colorless crystalline

Formula: Na₂S₂O₃ · 5H₂O

Molecular Weight: 248.19

pH: 6.0 – 8.5 at 20 °C (68 °F)

MP: 52 °C (126 °F)

Density: 1.01 g/mL        

Solubility: Soluble in water

Other: Thiosulfate anion reacts stoichiometrically with iodine, reducing it to iodide.

Stock Status : Readily Available

Purity : 99%

Storage : Hygroscopic; keep tightly closed in a dry, well-ventilated place

Uses of Sodium thiosulfate

In photography, papermaking, dechlorination of water, lab reagent, bleaching, and in patina recipes to make greens and blues (copper, brass, bronze)

Transport Information for Sodium thiosulfate

Not Regulated

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