Sodium Thiosulfate, 99%
Sodium Thiosulfate, 99% – Laboratory Grade
High-Purity Reducing & Complexing Agent for Analytical and Technical Applications
Product Identification
Chemical & Physical Information
Product Name: Sodium Thiosulfate
Catalogue Number: ASC-1059
CAS Number: 7772-98-7
Chemical Formula: Na₂S₂O₃
Molecular Weight: 158.11 g/mol
Form: White crystalline solid
Grade: Laboratory / Analytical Grade
Purity: ≥ 99 %
Product Description
Sodium Thiosulfate is a high-purity laboratory-grade inorganic compound widely used for its reducing, complexing, and dechlorinating properties. It is an essential reagent in analytical chemistry, particularly in iodometric titrations, and is extensively applied in water treatment, photographic processing, textile manufacturing, and technical laboratory workflows.
Its excellent water solubility and predictable reactivity make sodium thiosulfate a reliable reagent for both routine and specialised laboratory applications. Ausamics Sodium Thiosulfate is supplied as a free-flowing crystalline solid, ensuring consistent handling and reproducible performance.
Principle of Use
Functional Role
Acts as a reducing agent in redox reactions
Forms stable complexes with iodine and silver ions
Neutralises residual oxidising agents such as chlorine
Typical Characteristics
Physicochemical Properties
Appearance: White crystalline solid
Solubility: Highly soluble in water (≈210 g/L at 20 °C)
pH (50 g/L at 20 °C): 6.0–8.5
Density: 1.67 g/cm³ at 20 °C
Thermal Behaviour: Decomposes upon heating
Typical Applications
Analytical Chemistry
Iodometric titrations
Redox and quantitative chemical analyses
Water Treatment
Dechlorination of potable and process water
Neutralisation of residual chlorine and oxidants
Photography
Fixing agent for removal of unreacted silver halides
Photographic processing and archival workflows
Textile & Industrial Use
Bleaching agent and mordant in dyeing processes
Chemical processing and finishing applications
Aquaculture & Environmental Research
Detoxification of water by neutralising harmful substances
Laboratory studies involving aquatic systems
Key Features
Product Advantages
High purity (≥ 99 %) laboratory-grade material
Excellent solubility and reactivity
Reliable reducing and complexing performance
Free-flowing crystalline form for easy handling
Consistent batch-to-batch quality
Safety & Handling
Hazard Information
Causes skin irritation (H315)
Causes serious eye irritation (H319)
May cause respiratory irritation (H335)
Handling Precautions
Wear appropriate PPE including gloves, eye protection, and protective clothing
Avoid inhalation of dust
Ensure adequate ventilation during handling
Refer to the Safety Data Sheet (SDS) for detailed safety information.
Storage & Stability
Storage Conditions
Store in a cool, dry, well-ventilated place
Keep container tightly sealed
Protect from moisture
Avoid contact with acids and strong oxidising agents
Stable under recommended storage conditions
Intended Use
Regulatory Statement
For laboratory research, analytical, industrial, and technical use only.
Not intended for food, drug, medical, or therapeutic applications.
Packaging Information
Availability
Available in multiple pack sizes
Bulk quantities and custom packaging available on request
Quality & Supply Assurance
Manufacturing & Documentation
Manufactured under controlled quality systems
Certificate of Analysis (COA) available upon request
Safety Data Sheet (SDS) available
Technical support provided by Ausamics Life Science
Customs & Trade Information
Classification
HS / AHECC Code: 2832.30.00
Thiosulfates