Ar Sodium Thiosulphate
Analytical Reducing
Analytical Reagent

AR Grade Sodium Thiosulphate (Na₂S₂O₃)

Analytical Reagent grade sodium thiosulphate manufactured for iodometric titrations, analytical chemistry, and photographic applications. Our AR grade Na₂S₂O₃ provides reliable reducing properties for research applications, analytical procedures, and precise sulfur chemistry experiments.

  • Analytical Grade Purity
  • Iodometric Titration Standard
  • Reducing Agent Properties
  • Research Laboratory Applications
  • Photographic Applications
  • Precision Analytical Procedures
Request Quote Technical Support

Technical Specifications

Chemical Name: Sodium Thiosulphate
Chemical Formula: Na₂S₂O₃·5H₂O
CAS Number: 10102-17-7
EINECS Number: 231-867-5
Molecular Weight: 248.18 g/mol (pentahydrate)
Purity: ≥99.0% (AR Grade)
Physical State: Colorless crystals
Melting Point: 48°C (pentahydrate)
Solubility (20°C): 70 g/100ml water
pH (5% solution): 6.5 - 9.5
Chloride (Cl): ≤0.01%
Sulfate (SO₄): ≤0.02%
Storage Temperature: 15-30°C, dry place
Packaging: 250g, 500g, 1kg, 2.5kg bottles

Applications

Iodometric Titrations
Reducing Agent
Analytical Chemistry
Photographic Fixer
Volumetric Analysis
Chlorine Neutralization
Educational Laboratories
Industrial Analysis
Research Applications
Pharmaceutical Testing
Water Treatment
Redox Standardization

Industry-Specific Grades

DRAVYOM offers specialized sodium thiosulphate grades tailored for specific analytical and industrial requirements, ensuring optimal performance and regulatory compliance across diverse laboratory applications.

AR Grade (Analytical Reagent)
Purity: ≥99.0% Chloride: ≤0.01% Sulfate: ≤0.02% Application: General analytical procedures
Primary Standard Grade
NIST Traceable Purity: 99.95-100.05% Standardized Solutions Application: Volumetric analysis
Photographic Grade
Ultra-pure quality Heavy Metals: <5 ppm Photography optimized Application: Film processing
Technical Grade
Industrial Applications Cost-effective Bulk Quantities Application: Water treatment

Quality Standards

DRAVYOM's AR Grade Sodium Thiosulphate is manufactured under stringent quality control protocols, meeting international analytical standards including ACS, USP, EP, and pharmacopoeia specifications. Our analytical-grade production ensures consistent performance and regulatory compliance.

ISO 9001:2015 Certified Manufacturing
ACS Primary Standard Grade
≥99.0% Purity Guarantee
Standardized Solution Ready
Superior Titration Performance
Batch-to-Batch Consistency
Traceable Certificate of Analysis
Climate-Controlled Logistics

Advanced Chemical Properties & Performance

AR Grade Sodium Thiosulphate exhibits exceptional reducing properties essential for iodometric titrations. Its pentahydrate crystal structure and precise stoichiometry ensure reliable performance in analytical procedures requiring accurate redox determinations.

Redox Properties
Standard Potential: +0.08 V (S₄O₆²⁻/S₂O₃²⁻)
Equivalent Weight: 248.18 g/mol (pentahydrate)
Normality Factor: 1 (single electron transfer)
Reducing Capacity: Strong reducing agent
Crystal Structure
Hydration State: Pentahydrate (Na₂S₂O₃·5H₂O)
Crystal System: Monoclinic structure
Water Content: 36.2% by weight
Solubility: 70.1 g/100mL water (20°C)
Analytical Performance
Titration Accuracy: ±0.02% relative precision
Endpoint Detection: Sharp starch-iodine endpoint
Solution Stability: 6 months standardized
pH Stability: Neutral to slightly alkaline

Performance Characteristics

Detailed performance metrics demonstrate Sodium Thiosulphate superiority in analytical applications with exceptional reducing power, precise titration endpoints, and reproducibility across diverse iodometric procedures.

Titration Precision

Accuracy: ±0.02% relative deviation

Superior analytical precision
Endpoint Clarity

Detection: Sharp starch-iodine transition

Clear visual endpoint
Solution Stability

Duration: 6 months standardized

Extended analytical viability
Crystal Quality

Purity: 99.5%+ pentahydrate form

Consistent hydration state

Safety Information

Generally safe compound with low toxicity. May cause mild eye and skin irritation. Avoid generating dust during handling. Use standard laboratory protective equipment including safety goggles, gloves, and lab coats. Ensure adequate ventilation in work areas.

Eye Irritant
Avoid Dust
Handle with Care

Storage & Handling

Store in original containers in a cool, dry place away from strong acids and oxidizing agents. Keep containers tightly closed to prevent moisture absorption and dehydration. Use clean, dry measuring equipment to prevent contamination.

Cool, dry storage (15-25°C)
Away from acids/oxidizers
Moisture-proof containers
Clean measuring equipment

Chemical Mechanisms & Reaction Pathways

Sodium thiosulphate demonstrates versatile reducing properties through thiosulfate oxidation mechanisms, enabling iodometric titrations, silver halide complexation, and photographic fixing with precise analytical applications.

Iodometric Reactions

S₂O₃²⁻ reduces iodine to iodide forming tetrathionate in quantitative titrations

Primary standard for iodometric analysis
Silver Complexation

Forms stable silver thiosulfate complexes dissolving silver halides

Photographic fixing and silver recovery
Antioxidant Action

Neutralizes oxidizing agents and free radicals in analytical systems

Protective reducing environment
Quantitative Analysis

Precise stoichiometry enables accurate analytical determinations

Reliable analytical standard

Regulatory Compliance & Documentation

Comprehensive regulatory compliance ensures global laboratory access with complete documentation packages supporting international analytical standards and iodometric method validations.

ACS Primary Standard

American Chemical Society primary standard specifications

ISO 3696 Standard

International standard for analytical grade reagent specifications

USP Grade Available

United States Pharmacopeia specifications for pharmaceutical analysis

REACH Registration

European Union chemical regulation compliance

ASTM Method Support

American Society for Testing Materials analytical protocols

SDS Documentation

Multi-language Safety Data Sheets (16 sections, GHS compliant)

Technical Support & Value-Added Services

DRAVYOM's analytical chemistry team provides comprehensive iodometric method support, troubleshooting assistance, and analytical services to optimize sodium thiosulphate performance in your specific applications.

Iodometric Development
  • Iodometric titration protocols
  • Standardization procedures
  • Endpoint detection methods
  • Interference elimination
Analytical Services
  • Primary standard verification
  • Purity analysis testing
  • Water content determination
  • Method validation support
Technical Support
  • Iodometric troubleshooting
  • Standardization training
  • Laboratory protocol development
  • Quality control guidance
Supply Solutions
  • Consistent standard quality
  • Emergency supply arrangements
  • Custom hydration grades
  • Climate-controlled distribution

Environmental Impact & Sustainability

Our sodium thiosulphate production emphasizes environmental responsibility through sustainable manufacturing practices, sulfur recovery systems, and comprehensive environmental impact management for analytical operations.

Sulfur Recovery

Advanced sulfur compound recovery and recycling systems

Water Conservation

Efficient crystallization processes with water recycling

Clean Production

Low-energy crystallization and manufacturing processes

Safe Disposal

Environmentally safe oxidation and disposal protocols

ISO 14001

Environmental management system certified production

Silver Recovery

Enables silver recovery from photographic waste streams

Manufacturing Excellence & Quality Control

DRAVYOM's state-of-the-art primary standard manufacturing facility employs advanced crystallization technology with continuous monitoring systems to ensure consistent sodium thiosulphate quality and performance across all production batches.

Crystallization Process

Controlled crystallization with precise hydration control for pentahydrate formation

Primary standard grade purity and stability
Quality Testing

Comprehensive analysis including assay, water content, and trace impurities

Iodometric and gravimetric verification
Quality Systems

ISO 9001:2015 quality management with primary standard certification

Continuous improvement and traceability
Packaging Control

Moisture-proof containers with desiccant protection and stability preservation

Chemical stability and contamination prevention

Market Applications & Performance Data

Comprehensive analytical laboratory data demonstrating sodium thiosulphate effectiveness across diverse applications with quantified performance metrics and iodometric method validations.

Iodometric Titrations
Purity: 99.99%+ Na₂S₂O₃·5H₂O Precision: ±0.01% RSD reproducibility Stability: Primary standard grade
Educational Institutions
Curriculum Support: 200+ analytical protocols Reproducibility: >99.5% consistent results Teaching Value: Fundamental titration standard
Analytical Labs
Reliability: 99.99% batch consistency Efficiency: Rapid titration endpoints Versatility: Multiple analytical applications

DRAVYOM Competitive Advantages

Primary Standard Excellence

Consistently ultra-pure sodium thiosulphate with NIST traceability for precise iodometric standardization

Reliable Supply

Guaranteed availability with strategic inventory management and specialized production scheduling

Analytical Expertise

Dedicated analytical chemistry team provides iodometric method development and standardization support

Quality Assurance

Traceable certificates with comprehensive purity validation and analytical method support

Global Standards

International compliance with ACS, USP, and primary standard specifications for worldwide acceptance

Partnership Approach

Collaborative relationships with analytical laboratories and custom primary standard development services