Sodium Thiosulfate

Product Overview

Sodium Thiosulfate (Na₂S₂O₃) is a high-purity, Reagent Grade inorganic compound utilized extensively in industrial and laboratory settings. Available as a white crystalline powder, it acts as a potent reducing agent and dechlorinating specialist. This product meets rigorous specifications for purity, ensuring consistent reaction kinetics for analytical chemistry, water treatment, and chemical processing.

Primary functional uses include the neutralization of residual chlorine in water systems, fixing agents in photographic processing, and titration standards in iodometry. Its high solubility and stability make it suitable for seamless integration into aqueous processing streams. The 2 lb to 55 lb packaging options cater to both bench-scale research and bulk industrial requirements.

Key Properties

• CAS Number: 7772-98-7
• Chemical Formula: Na₂S₂O₃
• Grade: Reagent
• Appearance: White crystalline powder
• Solubility: Highly soluble in water
• Specific Gravity: 1.667 g/mL (25°C)
• Molecular Weight: 158.11 g/mol
• Assay: High purity (Typical 99%+)

Common Applications

• Water Treatment: Neutralizes chlorine and chloramines in municipal and industrial wastewater streams to protect downstream equipment and biology.
• Analytical Chemistry: Primary standard in iodometric titrations for determining oxidizing agent concentrations.
• Photography: dissolve unexposed silver halides in film and paper processing (fixer).
• Textile Processing: Antichlor agent used to remove excess chlorine from bleached fabrics to prevent fiber damage.
• Metal Finishing: Surface preparation and extraction processes.
• Chemical Synthesis: Reducing agent in various inorganic preparations.

Safety & Handling

Handle in accordance with good industrial hygiene and safety practice. Wear appropriate Personal Protective Equipment (PPE), including chemical-resistant gloves, safety goggles, and protective clothing to prevent skin and eye contact. Store in a cool, dry, well-ventilated area away from incompatible materials, specifically strong oxidizers and acids. Keep containers tightly closed to prevent moisture absorption.

Refer to the Safety Data Sheet (SDS) for comprehensive hazard information and emergency response guidelines.

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