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Chemical reagent
Sodium thiosulfate

Product name

Sodium thiosulfate anhydrous

Specification

Reagent grade

Molecular formula

Na2S2O3

CAS

7772-98-7

H.S. CODE

2832300000

Molecular weight

158.09

Appearance

White powder

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 standardEnterprise Standard

Test items

Specification

AR grade

CP grade

Appearance

White powder

White powder

Assay

99.0%

97.0%

pH

5.0-8.0

5.0-8.0

Appearance of solution

Conform

Conform

Water insoluble

0.01%

0.015%

Residues on ignition

0.01%

0.3%

Sulfate and sulfite

0.3%

0.8%

Sulfide

0.0005%

0.001%

Calcium

0.005%

-

Heavy metals

-

0.003%

Storage

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

Product categories
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