Sodium Thiosulfate Pentahydrate

Basic Information of Sodium Thiosulfate Pentahydrate

CAS No.:	10102-17-7
EC No.:	600-156-5
Linear Formula:	Na₂S₂O₃·5H₂O
Molecular Weight:	248.18
Appearance:	Transparent Liquid
Melting point:	48.5 °C
Density:	1.01 g/mL at 25 °C
Solubility:	Highly soluble in water. Insoluble in alcohol.
Hygroscopicity:	Tends to effloresce (lose water of crystallization) in dry air above 33 °C and deliquesce (absorb moisture and dissolve) in very humid air.
RIDADR:	Strong reducing agent. Generally stable under normal conditions but can decompose in acidic solutions, releasing sulfur and sulfur dioxide.
Chemical Structure:

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Primary Applications of Sodium Thiosulfate Pentahydrate

Sodium Thiosulfate Pentahydrate's strong reducing capabilities, ease of handling, and versatility make it an incredibly valuable and widely used compound with applications across numerous industries:

1. Photography (Fixer):

   It is universally known as "Hypo" and is the primary fixing agent in 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.

2. Water Treatment and Dechlorination:

   It is widely used as an effective dechlorinating agent to neutralize residual chlorine and chloramines from 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 dialysis.

3. Medical and Pharmaceutical Applications:

   Sodium Thiosulfate is used as an antidote for cyanide poisoning, converting cyanide to the less toxic thiocyanate. It is also applied topically to treat certain fungal skin infections (e.g., tinea versicolor) and has uses in some chemotherapy regimens to reduce heavy metal toxicity.

4. Analytical Chemistry:

   It is a standard reducing agent and titrant in iodometric titrations, used to accurately determine the concentration of oxidizing agents (e.g., chlorine, iodine) in various samples and solutions.

5. Gold and Silver Extraction:

   In the mining industry, particularly in hydrometallurgy, it is explored and used as a less toxic alternative to cyanide for leaching gold and silver from ores, especially for complex or refractory ores.

6. Textile and Paper Industries:

   It can be used as a dechlorinating agent after bleaching processes in both textile and paper manufacturing, preventing damage to fibers from residual bleaches.

• Exceptional Purity & Consistent Quality: Our Sodium Thiosulfate Pentahydrate is manufactured to stringent purity specifications, crucial for achieving precise results in analytical applications, effective water treatment, and reliable photographic 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.