Sodium hyposulphite, nowadays called sodium thiosulphateformerly an inorganic crystalline compound with the formula Na2S2O3-5H2O. Sodium hyposulphite is a white crystalline solid. It is very soluble in water and in turpentine oil. Its main use is as a fixing agent in photography, for film development and extraction of silver from its ores. Sodium hyposulphite is also used for chlorine separation in bleaching and paper making in chemical manufacturing, as a source of sulphide ion, industrial treatments of paper, textiles, water bleaching, chromium dye, salt sequestrant. Buy Sodium Hyposulphite in different formats.
IDENTIFICATION AND PROPERTIES
Name: Sodium hyposulphite
Synonyms: Sodium thiosulphate
Chemical formula: Na2S2O3-5H2O
CAS: 7772-98-7
EC: 231-867-5
- Appearance: White crystalline solid
- pH: 6.5-9.5 (20%)
- Flammability (solid,gas): No
- Relative density: 1.729 gr/cm3
- Melting point: 48ºC
- Water solubility: Soluble
HYPOSULPHITE USES
- Fixing agent in photography
- Film development
- Extraction of silver from its ores
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