Product name: Sodium thiosulfate
Alias: hypo; hyporice; sodium hyposulfite; sodium subsulfite; sodium thiosulfate anydrous; thiosulfuric acid, disodium salt; thiosulfuric acid (h2s2o3), disodium salt; thiopivalic acid sodium salt; sodi-um hyposulfide; dechlorinating solution; betz 0235; sulfurothioic O,O-acid; hydrogen sulfurothioate
CAS RN: 7772-98-7
Molecular formula: Na₂S₂O₃
Molecular weight: 158.10800

Properties
Appearance and properties: colorless crystal or white powder. Specific gravity is 1.69. It is insoluble in alcohol and soluble in 0.5 parts of water and its aqueous solution presents neutral (pH6.5-8.0). Its anhydride is powder that is soluble in water and hardly soluble in alcohol.
Density: 1.01 at 25 °C
Melting point: 48°C
Boiling point: 100°C
Stability: stable. Incompatible with strong acid, strong oxidant, iodine, and mercury.
Storage: 2-8^oC

Uses
The product is mainly used as fixing agent in photography; as reducing agent of dichromate in tanning; neutralizer and mordant of nitrogenous tail gas; and bleaching agent of straw and wool.

Storage tightly sealed.