Chemicals

sodium thiosulfate pentahydrate Cas:10102-17-7

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Synonyms：

Sodium thiosulfate pentahydratedisodium,dioxido-oxo-sulfanylidene-λ<sup>6</sup>-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, 25^oC)	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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