5 lb white HDPE bottle of Sodium Thiosulfate (CAS #7772-5) with safety handling instructions, blue-green gradient label and ribbed closure.
2lb Sodium Thiosulfate in white HDPE bottle with safety-sealed cap, CAS #7772-98-7, non-DOT regulated chemical with PPE handling requirements.
2 LBS white HDPE bottles of Sodium Thiosulfate (CAS #7772-98-7) with green-blue gradient labels, safety warnings, and non-DOT regulated status.
2 LBS white HDPE bottles of Sodium Thiosulfate (CAS #7772-98-7) by Alliance Chemical with safety storage instructions and turquoise-blue gradient label.
55lb bags of sodium thiosulfate (CAS #7772-98-7) by Alliance Chemical, stacked in white industrial packaging with hazard warnings and storage instructions.
55lb bag of sodium thiosulfate (CAS #7772-98-7) by Alliance Chemical, featuring danger symbol, storage requirements, and emergency contact information.
5 lb container of Sodium Thiosulfate (CAS #7772-98) in white HDPE bottle with safety handling instructions, ribbed cap, green-blue gradient label.
5-lb bottles of Sodium Thiosulfate (CAS #7772) in white HDPE containers with blue-green labels, safety handling instructions, 4-pack industrial grade.

Sodium Thiosulfate

Category : Inorganic Compounds

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Sodium Thiosulfate

$15.44
2lb Sodium Thiosulfate in white HDPE bottle with safety-sealed cap, CAS #7772-98-7, non-DOT regulated chemical with PPE handling requirements.
2 LBS white HDPE bottles of Sodium Thiosulfate (CAS #7772-98-7) with green-blue gradient labels, safety warnings, and non-DOT regulated status.
2 LBS white HDPE bottles of Sodium Thiosulfate (CAS #7772-98-7) by Alliance Chemical with safety storage instructions and turquoise-blue gradient label.
55lb bags of sodium thiosulfate (CAS #7772-98-7) by Alliance Chemical, stacked in white industrial packaging with hazard warnings and storage instructions.
55lb bag of sodium thiosulfate (CAS #7772-98-7) by Alliance Chemical, featuring danger symbol, storage requirements, and emergency contact information.
5 lb white HDPE bottle of Sodium Thiosulfate (CAS #7772-5) with safety handling instructions, blue-green gradient label and ribbed closure.
5 lb container of Sodium Thiosulfate (CAS #7772-98) in white HDPE bottle with safety handling instructions, ribbed cap, green-blue gradient label.
5-lb bottles of Sodium Thiosulfate (CAS #7772) in white HDPE containers with blue-green labels, safety handling instructions, 4-pack industrial grade.
  • Description
  • Product Documents

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.

Related Products

Property Value
Molecular Weight 158.11 g/mol g/mol
Formula Na2S2O3
Grade ACS
Flash Point N/A
Form Solid
Solubility High water solubility, moderate ethanol solubility
Appearance White crystalline powder
Melting Point 48°C °C
Boiling Point 100°C °C
Specific Gravity 1.667
Industry Environmental, Industrial, Wastewater

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