Chemical reagent
Sodium thiosulfate, pentahydrate

Product name

Sodium thiosulfate, pentahydrate

Specification

Reagent grade

Molecular formula

Na2S2O3·5H2O

CAS

10102-17-7

H.S. CODE

2832300000

Molecular weight

248.18

Appearance

Colorless crystal

Package

25KG Woven bags or fiber drums

Property

Colorless crystalline or translucence powder. The relative density 1.769. Hot to 100 ℃ began to decompose into ammonia and acid hydrogen amines. Soluble in water, insoluble in ethanol and acetone.

Application

Analytics reagents. As the support point electrochemical analysis and solution quality. Also used in the microbiological media, ammonium salt preparation.

Test standardGB/T 6372006

Test items

Specification

AR grade

CP grade

Appearance

Colorless crystal

Colorless crystal

Assay

99.0%

98.5%

pH

6.0~7.5

6.0~7.5

Appearance of solution

Conform

Conform

Water insoluble

0.005%

0.01%

Chloride

0.02%

-

Sulfate and sulfite

0.05%

0.1%

Sulfide

0.00025%

0.0005%

Total nitrogen

0.005%

-

Magnesium

0.001%

-

Calcium

0.003%

0.005%

Iron

0.0005%

0.001%

Heavy metals

0.0005%

0.001%

Storage

    Store in a cool, dry and well ventilated place. Keep away from incompatible substances. Keep container closed.

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