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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
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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：Enterprise Standard
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Test items |
Specification |
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AR grade |
CP grade |
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Appearance |
White powder |
White powder |
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Assay |
≥99.0% |
≥97.0% |
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pH |
5.0-8.0 |
5.0-8.0 |
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Appearance of solution |
Conform |
Conform |
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Water insoluble |
≤0.01% |
≤0.015% |
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Residues on ignition |
≤0.01% |
≤0.3% |
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Sulfate and sulfite |
≤0.3% |
≤0.8% |
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Sulfide |
≤0.0005% |
≤0.001% |
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Calcium |
≤0.005% |
- |
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Heavy metals |
- |
≤0.003% |
Storage：
Store in a cool, dry and well ventilated place. Keep away from incompatible substances. Keep container closed.
