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Sodium Thiosulfate
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Product Introduction
Product Description
Sodium Thiosulfate, commonly known as "hypo" or antichlor, is a colorless transparent crystal or white granular powder. Industrial products often exhibit a pale yellow tint due to trace impurities. It is an important reducing agent and complexing agent, widely used in photographic fixing, textile dyeing auxiliaries, water treatment (dechlorination), cyanide antidote, leather tanning, mining/metallurgy, and chemical synthesis.
Working Principle
Its core functionality is based on the reducing ability and complexing capacity of the thiosulfate ion:
Complexation: Forms stable, soluble complexes with metal ions such as silver and gold, used in photographic fixing and precious metal recovery.
Reduction: Acts as a mild reducing agent, converting halogens like chlorine and iodine into harmless halide ions, applied in dechlorination of water and textiles.
Detoxification: Reacts with cyanide ions to form less toxic thiocyanate, serving as a recognized cyanide antidote.
Sulfur Donor: Can act as a sulfur source in chemical reactions, participating in sulfur transfer processes.
Specification
Anhydrous Sodium Thiosulfate
Main Content: Sodium thiosulfate (Na₂S₂O₃) content is typically not less than 99.0%.
Key Impurity Control: Water-insoluble matter is generally ≤0.01%, sulfate & sulfite (as SO₄) ≤0.05%, heavy metals (as Pb) ≤0.001%.
Appearance: White crystalline powder or granules.
Product Features
Strong Complexing Ability: Excellent ability to complex metal ions like silver and copper.
Mild Reducing Property: Provides stable and controllable reduction without vigorous reactions.
Good Water Solubility: Highly soluble in water; pentahydrate solubility is approximately 70g/100mL water at 20°C.
Acid Decomposition: Decomposes in acidic conditions to produce sulfur and sulfur dioxide, emitting a slight sulfur odor.
Oxidation Stability: Stable in alkaline or neutral environments but may slowly oxidize in air.
Thermal Instability: Decomposes when heated to elevated temperatures.
Environmentally Benign: Primary decomposition products are sodium sulfate, resulting in relatively low environmental toxicity.
Product Parameters
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