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Sodium Thiosulphate
- Origin
- : China
- CAS Number
- : 7772-98-7
- HS Code
- : 2832.30.00
Basic Info
- IUPAC Name
- : disodium thiosulfate pentahydrate
- Molecular Formula
- : Na2S2O3·5H2O
- Molecular Weight (g/mol)
- : 248.1900
- Synonyms & Trade Names
- : Sodium thiosulphate; Hypo; Sodium thiosulfate pentahydrate; E539
- Purity / Assay (%)
- : 99% min
- Grade / Quality Level
- : Technical Grade
- Physical Form
- : Solid
- Concentration
- : Pure substance
- Appearance / Color
- : White to off-white solid
- Odor
- : Odorless
- Melting Point (°C)
- : 48.0000
- Density (g/cm³)
- : 1.6670
- Solubility in Water
- : Freely soluble
- UN Number
- : Not applicable
- H-Statements
- : None
- P-Statements
- : P260
- REACH Status
- : Registered
- Drug Precursor Status
- : Non-precursor
- Storage Class (GHS)
- : 13
- Storage Conditions
- : Cool, dry; sealed; hygroscopic
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About Sodium Thiosulphate
Sodium thiosulfate is a white powder and has a formula of Na2S2O3. It exists mainly in the form of pentahydrate and is called sodium hyposulfite. It is a stable inorganic compound, but decomposes at high temperature to sodium sulfite and sulfur.
The thiosulfate anion has a tetrahedral geometry and is notionally derived by replacing one of the oxygen atom with sulfur atom. It reacts with dilute acids to produce sulfur, sulfur dioxide and water. Sodium thiosulfate is soluble in water and together with sodium nitrite, they are used to treat cyanide poisoning.
The phosphate anion reacts with iodine stiochiometrically, reducing it to iodide as it is oxidized to tetrathionate. Due to the quantitative nature of this reaction, sodium thiosulfate is often used as a titrant in iodometry.
Manufacturing Process
Industrial Method
Sodium thiosulfate can be manufactured industrially as a by-product using the Effluent from the manufacturing process of sodium sulfide or sulfur dye. By reacting the liquid affluent with sulfur dioxide, and boiling nitro compounds with sodium polysulfide solution, yield a leach liquor of sodium thiosulfate. This is then purified, processed and standardized for industrial consumption.
Laboratory Method
Sodium thiosulfate can be manufactured using sodium sulfite or sodium hydroxide and sulfur. By boiling and heating them, both chemicals dissolve and sodium thiosulfate crystallizes out of solution upon cooling. Alternatively, sodium thiosulfate can also be manufactured using liquid affluent obtained in the production of sodium sulphide.