Sodium Thiosulfate Anhydrous

Basic Information of Sodium Thiosulfate Anhydrous

CAS No.:	7772-98-7
EC No.:	231-867-5
Linear Formula:	Na₂O₃S₂
Molecular Weight:	158.11
Appearance:	Transparent Liquid
Melting point:	48°C
Density:	1.01 g/mL at 25 °C
Solubility:	Highly soluble in water. Insoluble in alcohol.
Concentration:	Offers a higher concentration of active Na₂S₂O₃ per unit weight due to the absence of water molecules.
Nature:	Strong reducing agent. Generally stable under normal conditions but can decompose in acidic solutions.
Chemical Structure:

Our commitment to delivering high-purity Sodium Thiosulfate Anhydrous ensures a reliable and efficient component for your critical processes, particularly where water content is a concern.

Primary Applications of Sodium Thiosulfate Anhydrous

Sodium Thiosulfate Anhydrous's potent reducing capabilities, high purity, and efficient reactivity make it an incredibly valuable and widely used compound with applications across numerous industries:

1. Photographic Industry (Fixer):

   It is extensively used as a fixing agent in both traditional black-and-white and color photographic processes. It dissolves unexposed silver halides from photographic film and paper, stabilizing the image and making it light-fast. The anhydrous form is preferred for some concentrated solutions or dry formulations.

2. Water Treatment and Dechlorination:

   It serves as an efficient dechlorinating agent to neutralize residual chlorine and chloramines in municipal drinking water, wastewater, swimming pools, and industrial process water. This is vital before discharge or when chlorine interferes with other chemical processes, such as in brewing, aquaculture, and pharmaceutical production.

3. Analytical Chemistry:

   Due to its high purity and consistent composition, Sodium Thiosulfate Anhydrous is an essential reducing agent and titrant in iodometric titrations, used to accurately determine the concentration of oxidizing agents in various samples.

4. Medical and Pharmaceutical Applications:

   While often the pentahydrate form is used, Sodium Thiosulfate (including high-purity anhydrous for specific formulations) acts as an antidote for cyanide poisoning, converting cyanide to less toxic thiocyanate. It's also used topically for certain fungal skin conditions.

5. Gold and Silver Extraction:

   In the mining industry, particularly in hydrometallurgy, it is used as a less toxic lixiviant (leaching agent) for the extraction of gold and silver from ores, especially for complex or refractory ores.

6. Chemical Manufacturing:

   It serves as a reducing agent in various chemical synthesis processes and as an intermediate for the production of other sulfur-containing compounds.

• Exceptional Purity & Concentrated Form: Our Sodium Thiosulfate Anhydrous is manufactured to stringent purity specifications, offering a higher active chemical concentration per unit weight, which is crucial for precise formulations and efficient processes.

• Commitment to Quality & Safety: We adhere to the highest industry standards for quality management, safety, and environmental responsibility across all our operations, ensuring peace of mind for our clients.