5-lbs plastic bottle of Alliance Chemical Sodium Thiosulfate with a white screw cap and product label.
One 2-lbs plastic bottle of Alliance Chemical Sodium Thiosulfate with a white ribbed cap and product label.
Two 2-lbs plastic bottles of Alliance Chemical Sodium Thiosulfate with white screw caps and product labels.
2 LBS HDPE bottles of Sodium Thiosulfate by Alliance Chemical
Four 5.5-lbs bags of Alliance Chemical Sodium Thiosulfate with labeled white packaging and green accents.
One 55-lbs bag of Alliance Chemical Sodium Thiosulfate with a sealed top and product label.
Two 5-lbs Alliance Chemical Sodium Thiosulfate bottles with white plastic screw cap and branded label.
Four 5-lbs plastic bottles of Alliance Chemical Sodium Thiosulfate with white ribbed screw caps and product labels.

Sodium Thiosulfate

Category : Inorganic Compounds

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Sodium Thiosulfate

$15.44
One 2-lbs plastic bottle of Alliance Chemical Sodium Thiosulfate with a white ribbed cap and product label.
Two 2-lbs plastic bottles of Alliance Chemical Sodium Thiosulfate with white screw caps and product labels.
2 LBS HDPE bottles of Sodium Thiosulfate by Alliance Chemical
Four 5.5-lbs bags of Alliance Chemical Sodium Thiosulfate with labeled white packaging and green accents.
One 55-lbs bag of Alliance Chemical Sodium Thiosulfate with a sealed top and product label.
5-lbs plastic bottle of Alliance Chemical Sodium Thiosulfate with a white screw cap and product label.
Two 5-lbs Alliance Chemical Sodium Thiosulfate bottles with white plastic screw cap and branded label.
Four 5-lbs plastic bottles of Alliance Chemical Sodium Thiosulfate with white ribbed screw caps and product labels.
  • Description
  • Product Documents
  • Chemical Profile

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

Frequently Asked Questions About Sodium Thiosulfate

What is Sodium Thiosulfate and what is its chemical formula?
Sodium Thiosulfate is a chemical compound with the molecular formula Na2S2O3, registered under CAS Number 7772-98-7 by the Chemical Abstracts Service (PubChem), with a molecular weight of 158.11 g/mol g/mol. Alliance Chemical supplies Sodium Thiosulfate in ACS grade for laboratory, industrial, and commercial applications.
What are the physical properties of Sodium Thiosulfate?
According to the NIOSH Pocket Guide to Chemical Hazards, Sodium Thiosulfate is supplied as a solid with a white crystalline powder appearance. It has a melting point of 48°C°C, a boiling point of 100°C°C, a flash point of N/A. The specific gravity is 1.667 relative to water. Solubility: High water solubility, moderate ethanol solubility.
What grade and purity of Sodium Thiosulfate does Alliance Chemical offer?
Alliance Chemical offers Sodium Thiosulfate in ACS grade. Every lot ships with a Certificate of Analysis (COA) and Safety Data Sheet (SDS) prepared in accordance with OSHA Hazard Communication Standard 29 CFR 1910.1200 and GHS Revision 7. Download SDS.
What are common industrial applications of Sodium Thiosulfate?
Sodium Thiosulfate serves a wide range of sectors, including Environmental, Industrial, and Wastewater.Alliance Chemical provides the documentation and quality certifications required for use in regulated environments.
What PPE is required when handling Sodium Thiosulfate?
OSHA-mandated PPE per 29 CFR 1910.132-138:Nitrile gloves (8+ mil), safety goggles, flame-resistant clothing, grounded footwear, closed-toe chemical-resistant footwear. Respiratory protection (organic vapor cartridge) required in areas exceeding PEL/TLV per 29 CFR 1910.134. Emergency eyewash station and safety shower must be accessible within 10 seconds per ANSI Z358.1. Consult the SDS available from Alliance Chemical for complete PPE requirements.
What are the storage requirements for Sodium Thiosulfate?
Store perOSHA 29 CFR 1910.106: Approved flammable storage cabinet, maximum 60 gallons per cabinet, grounding/bonding required. Temperature range:15-25°C. Segregate from:oxidizers, ignition sources. Maximum storage:2-3 years unopened.
What is the emergency spill procedure for Sodium Thiosulfate?
Emergency response per EPA SPCC (40 CFR 112) and OSHA 29 CFR 1910.120: (1) Alert personnel, evacuate area to 100 feet. (2) Eliminate ignition sources if flammable. (3) Don PPE per SDS Section 8. (4) Stop leak if safe; use emergency shutoffs. (5) Contain with non-combustible absorbent materials, dike with sand/earth. (6)Absorb with vermiculite or commercial spill kits. (7) Collect in DOT-approved containers, label as hazardous waste. Check 40 CFR 302.4 for Reportable Quantity. Emergency: Chemtel 1-800-255-3924 (24/7). Non-emergency: Alliance Chemical 512-365-6838.
What is the DOT shipping classification for Sodium Thiosulfate?
DOT Classification per 49 CFR 172.101:UN1993 (Flammable Liquid, N.O.S.), Hazard Class3 (Flammable), Packing GroupII/III. Requires: Hazmat shipping papers (49 CFR 172.200), UN specification packaging (49 CFR 173), hazmat labels (172.400). Alliance Chemical ships all orders in DOT-compliant packaging with proper documentation.
How must Sodium Thiosulfate waste be disposed?
Disposal per RCRA (40 CFR 261-265):Characteristic waste D001 (Ignitable, flash point <60°C). Generator requirements: EPA ID number required if >100 kg/month (40 CFR 262.12). Use EPA-permitted Treatment, Storage, Disposal Facility (TSDF). Never discharge to sewer without POTW written approval (40 CFR 403). Container disposal: Triple rinse (40 CFR 261.7), offer for reconditioning/recycling. State regulations may be more stringent — check with your local environmental agency. Consult the Alliance Chemical SDS for product-specific disposal guidance.
Does Alliance Chemical provide an SDS and COA for Sodium Thiosulfate?
Yes. Alliance Chemical provides a Safety Data Sheet (SDS) and Certificate of Analysis (COA) for every lot of Sodium Thiosulfate. The SDS is prepared in accordance with OSHA Hazard Communication Standard 29 CFR 1910.1200 and the Globally Harmonized System (GHS) Revision 7, covering all 16 required sections including hazard identification, first aid measures, firefighting measures, handling and storage, exposure controls, and regulatory information. The SDS is available for download directly from this product page. COAs are available upon request by contacting Alliance Chemical at 512-365-6838.

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