Sodium thiosulfate, also known as sodium sulfite baking soda sea wave, is a common thiosulfate. The chemical formula is Na2S2O3. It is the product of replacing an oxygen atom with a sulfur atom in sodium sulfate, so the oxidation number of the two sulfur atoms is -2 and +6 respectively Specification
Sodium Thiosulfate Pentahydrate| TEST ITEMS | SPECIFICATION | RESULT OF TEST REPORT |
| ASSAY: | 99.00% MIN | 99.54% |
| WATER INSOLUBLES: | 0.01% MAX | 0.007% |
| SULPHIDES: | 0.001% MAX | 0.0008% |
| Fe: | 0.001% MAX | 0.0005% |
| S | 0.001% MAX | 0.0007% |
| ITEMS | STANDARD | TEST RESULT |
| Appearance | White powder crystal | Pass |
| Purity (%) | 97.0min | 98.03% |
| Insoluble substance in water(%) |
0.01%max |
PASS |
| Sulphide(%) | 0.001%max | PASS |
| Fe(%) | 0.005%max | 0.0007% |
| PH | 6.5~9.5 | 8.1 |
| Particle size(mesh) | 20-80 | PASS |
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