CASR |
: | 7681-57-4 |
Molecular Formula |
: | Na2S2O5 |
Molecular Weight |
: | 190.1 |
| Specifications | |
|---|---|
| Appearance: | White or almost white crystalline powder or colorless crystals. |
| Solubility: | Freely soluble in water. Slightly soluble in ethanol (96%). |
| Identification A (By pH): | 3.5 to 5.0 |
| Identification B (Reaction of sulfates): | White precipitate should form |
| Identification C (Reaction of sodium): | A dense white precipitate should form |
| Appearance of solution: | Clear and colorless solution |
| pH: | 3.5 to 5.0 |
| Thiosulfates: | The solution should remain clear for at least 15 min |
| Iron (Fe): | NMT 20 ppm |
| Assay: | 95.0% - 100.5% |
