Synonyms：
Sodium thiosulfate pentahydratedisodium,dioxido-oxo-sulfanylidene-λ6-sulfane,pentahydrate
molecular formula: H10Na2O8S2
Molecular weight: 248.18400
Physical Properties:
Appearance and Properties: Translucent crystal or white powder
Density: 1.01 g/mL at 25 °C
Boiling point: 100ºC
Melting point: 48.5 °C
Water solubility: 680 g/L (20 ºC)
Stability: Stable. Incompatible with strong acids, iodine, mercury.
Specification:
| Items of Analysis | Standard of Analysis | Test Results |
| Assay | ≥99.0% | 99.52% |
| Insoluble in water | ≤0.005% | 0.0016% |
| Chloride | ≤0.02% | ＜0.02% |
| Heavy metal (Pb) | ≤0.0005% | ＜0.0005% |
| Sulfates and Sulfites | ≤0.05% | ＜0.05% |
| pH (50g/L, 25oC) | 6.0-7.5 | 6.57 |
| Ca | ≤0.003% | ＜0.003% |
| Fe | ≤0.0005% | ＜0.0005% |
| Mg | ≤0.001% | 0.0003% |
| Sulfide | ≤0.00025% | ＜0.00025% |
| Total Nitrogen | ≤0.005% | ＜0.005% |
| Conclusion | Conforms to AR Standard |
Application:
The photosensitive industry is used as a photographic fixer. The paper industry is used as a chlorine remover after pulp bleaching. In the printing and dyeing industry, it is used as a dechlorination agent for cotton fabrics after bleaching. Analytical chemistry is used as a reagent for chromatographic analysis and volumetric analysis. It is used as detergent and disinfectant in medicine. Food industry is used as chelating agent, antioxidant, etc.
Package and Storage:
The warehouse is ventilated and dry at low temperature, and stored separately from oxidants, halogens and strong acids
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