Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise specializing in the research and development, manufacturing, and sales of fine chemicals. Headquartered in Jinan, Shandong, China, we are committed to delivering high-quality products to our global partners. Currently, over 90% of our products are exported to developed markets, including North America, Europe, Japan, South Korea, and the Middle East.
Product Description
Sodium thiosulfate (CAS: 7772-98-7), also called sodium hyposulfite or hypo, is an inorganic compound, commonly existing as pentahydrate (Na?S?O?·5H?O) with colorless transparent crystals or white powder. It has strong reducibility and good water solubility, widely used in industry, medicine, and analytical chemistry, and is non-toxic and environmentally friendly.
Uses
Medical & Clinical Applications: Mainly used as an antidote for cyanide and heavy metal poisoning, and a topical agent for skin itching and inflammation.
Industrial & Laboratory Applications: Used as a photographic fixing agent, iodometric titration standard reagent, water treatment dechlorinating agent, and in textile and electroplating industries.
Molecular Formula & Structure
- Molecular Formula: Na?S?O? (anhydrous); Na?S?O?·5H?O (pentahydrate)
- Molecular Weight: 158.11 g/mol (anhydrous); 248.18 g/mol (pentahydrate)
- Synonyms: Sodium hyposulfite; Hypo;
- Chemical Structure: Composed of Na? and S?O?2?; the pentahydrate contains 5 crystal water molecules, which are easy to lose when heated.
Physical & Chemical Properties
- Appearance: Colorless transparent crystals/white powder (pentahydrate); white powder (anhydrous), odorless with cool salty taste.
- Density: 1.729 g/cm3 (pentahydrate); 1.667 g/cm3 (anhydrous); Melting Point: 48.5 °C (pentahydrate); 100 °C (anhydrous, decomposes).
- Solubility: Highly soluble in water, soluble in glycerol, slightly soluble in ethanol.
- Stability: Stable under normal conditions; decomposes above 100 °C; incompatible with strong acids.
- Toxicity: Non-toxic; large oral intake may cause gastrointestinal discomfort.
Synthesis & Storage
- Synthesis: Industrially prepared by sulfur reduction or sodium sulfide method; pentahydrate is obtained by crystallization, anhydrous form by drying.
- Storage: Sealed, stored in cool dry place; avoid moisture, high temperature and strong acids; shelf life 2–3 years.
- Safety: Wear basic protective gear; avoid mixing with strong acids; dispose of waste properly.
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