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Sodium Thiosulfate Pentahydrate 99% AR Grade Reagent

Cas Number:10102-17-7
Formula: Na2S2O3•5H2O
Molar Mass:248.18
EC Number:231-867-5

Quantity:
  • AR
  • LABOR
  • 227102129

Sodium Thiosulfate Pentahydrate 99% AR Grade Reagent


Cas Number:10102-17-7

Formula: Na2S2O3·5H2O

Molar Mass:248.18

EC Number:231-867-5


Physicochemical properties:

Colorless crystals or white particles. Odorless. Micro-tidal solution in humid air. It is weathered in dry air above 33 ° C, and it can melt when it is heated to 48 ° C and lose crystal water at 100 ° C, and decompose at higher temperatures. It can be dissolved in 0.5 parts of water, insoluble in ethanol. The aqueous solution slowly decomposes at normal temperature, and the decomposition rate is accelerated by heating. The aqueous solution is almost neutral and with pH about 6.5 to 8.0.


Usage:

Redox titration. Microanalytical reagents. The cobalt is determined by spot analysis. Determination of blood sodium. A disaccharide iron urea medium or the like is prepared. Photographic fixer. Dechlorination agent.


Packing:

500g/25kg






Item of Analysis

Standard

Assay,%

99.0 min

pH(50g/L,25℃)

6.0~7.5

Transparency of solution

3 max

Insoluble in water,%

0.005 max

Chloride(Cl),%  

0.02 max

Sulfate and Sulfite(as SO4) ,%

0.05 max

Sulfide(S),%

0.00025 max

Nitrogen compounds(N),%

0.005 max

Magnesium(Mg),%

0.001 max

Calcium(Ca),%

0.003 max

Iron(Fe),%

0.0005 max

Heavy metals(as Pb),%

0.0005 max


Not a hazardous substance or mixture.


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