Topic summary
Sodium Thiosulphate
Extracted from the Wikipedia article Sodium thiosulfate.
Sodium thiosulfate (sodium thiosulphate) is an inorganic compound with the formula Na2S2O3·xH2O. Typically it is available as the white or colorless pentahydrate (x = 5), which is a white solid that dissolves well in water. The compound is a reducing agent and a ligand, and these properties underpin its applications. Historically known as "hyposulphite of soda", sodium thiosulfate is used in medicine as a treatment for cyanide poisoning. It is also a reliable photographic fixer and played a key role in the development of photography in the 19th century.