Understanding the fundamental chemical and physical properties of a compound is essential for its effective application, especially in specialized industries like photography and water treatment. Sodium Thiosulfate Pentahydrate (CAS 10102-17-7) is a fascinating inorganic salt with unique characteristics that make it indispensable in various processes. As a leading manufacturer and supplier of fine chemicals in China, we are committed to providing our clients with high-quality products and comprehensive technical information.

Physically, Sodium Thiosulfate Pentahydrate typically appears as large, translucent crystals or a white crystalline powder. It is highly soluble in water, which is a critical property for its use in aqueous solutions for applications such as chlorine neutralization and photographic fixing baths. While it is relatively stable, it can effloresce (lose water of hydration) in dry air, and its hydrated form can decompose when heated strongly, releasing sulfur dioxide and sodium sulfate.

Chemically, the thiosulfate ion (S2O3^2-) is the active species. Its ability to form stable complex ions with silver ions is the reason for its efficacy as a photographic fixer, where it dissolves unexposed silver halide crystals. This complexation reaction is highly specific and efficient. In its role as a dechlorinating agent, the thiosulfate ion acts as a reducing agent, reacting with chlorine (or hypochlorite) to produce sulfate ions and chloride ions, effectively neutralizing the oxidizing power of chlorine.

The chemical reactions are as follows: Na2S2O3 + 4Cl2 + 5H2O → 2NaHSO4 + 8HCl (for chlorine) and Na2S2O3 + 4NaOCl + H2O → 2Na2SO4 + 4NaCl + H2S2O3 (followed by decomposition of thiosulfuric acid). For industry professionals looking to buy Sodium Thiosulfate Pentahydrate, understanding these reactions ensures proper handling and optimal application. We invite you to purchase our high-purity Sodium Thiosulfate Pentahydrate, manufactured to exacting standards, to leverage these powerful chemical properties in your processes. Contact us for your chemical sourcing needs.