Sodium thiosulfate 5AQ
General Product Information
| Article | Sodium thiosulfate 5AQ |
| Synonyms |
Sodium thiosulphate, Sodium thiosulfate pentahydrate, Sodium hyposulphite, Hyposulphite of soda, Hypo |
| CAS No. | 10102-17-7 |
| EEG No. | – |
| EINECS No. | 231-867-5 |
| IMO | – |
| Tariff Code | 28323000 |
| UN No. | – |
| VLG/ADR | – |
Description
Sodium thiosulfate pentahydrate is an inorganic salt widely used in industry and laboratories for its properties as a reducing agent and complexing agent. It is a white, crystalline powder, which is highly soluble in water. The product is widely used in applications such as Water Treatment, analytical chemistry and mining. .
Characteristics
- Odor: –
- Hygroscopic: Yes.
- Color: White to Colorless.
- Grade: Technical.
- Solubility: Not soluble in water.
- Shape: Crystalline powder.
Physical & Chemical Properties
| Chemical Structure | Na2S2O3-5H2O |
| Molar Weight | 248.18 g/mol |
| Melting Point | Approx. 48 °C (decomposes). |
| Boiling Point | – |
| Density | 1.69-1.74 g/cm³ |
| Refractive Index | – |
| pH | 6-9 (at 10% solution) |
Applications
Sodium thiosulfate is applied in various ways, for instance:
1. Analytical Chemistry
Commonly used in redox titrations, especially for determining iodine levels (iodometry).
2. Water Treatment
Sodium thiosulfate is widely used to neutralize free chlorine and chloramines in drinking and process water, as well as in aquariums and swimming pools.
3. Metal Industry
Serves as a complexing agent for precious metals, especially at environmentally friendly gold extraction processes (as an alternative to cyanide).
4. Paper & Textile Industry
Used to neutralize residual bleaching agents (chlorine).
Interessing Links
- CAS Common Chemistry – Sodium thiosulfate pentahydrate
- European Chemicals Agency (ECHA) – For chemical information and regulations.
- PubChem – Thiosulfuric acid, disodium salt, pentahydrate – Chemical information by the National Library of Medicine of the National Center for Biotechnology Information (NIH-NCBI).
- Wikipedia – Sodium thiosulfate