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 standard:GB/T 637—2006
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.