Chemical Formula: Na?S?O? · 5H?O
Molecular Weight: 248.18 g/mol

Description:
Sodium Thiosulphate, commonly known as “Hypo”, is a colorless crystalline compound widely used in photography, water treatment, and analytical chemistry. It is readily soluble in water and known for its ability to neutralize chlorine and reduce oxidizing agents.

Hypo is also used as a fixer in photographic processing, removing unreacted silver halide from films and prints. Industrially, it serves as a reducing, dechlorinating, and complexing agent, especially in electroplating, chemical analysis, and gold extraction.

Applications

Photographic Industry:

• Acts as a fixing agent for developing photographic films and papers by dissolving unexposed silver halides.

Water Treatment:

• Used to remove excess chlorine from drinking water, wastewater, and swimming pools.

Chemical & Analytical Industry:

• Serves as a titrant in iodometric analysis and as a reducing agent in chemical reactions.

Electroplating & Metal Processing:

• Employed for metal recovery (e.g., gold extraction) and in metal cleaning formulations.

Textile & Leather:

• Used in bleaching, dyeing, and dechlorination processes after chlorination treatments.