CASR |
: | 7681-57-4 |
Molecular Formula |
: | Na2S2O5 |
Molecular Weight |
: | 190.1 |
| Specifications | |
|---|---|
| Description: | White crystals or crystalline powder having an odour of sulfur dioxide. |
| Solubility: | Freely soluble in water; slightly soluble in ethanol. |
| Test for sodium: | Passes test |
| Test for sulfite: | Passes test |
| Water insolubles: | The solution should be clear with only a trace of suspended matter. |
| pH: | 4.0 - 4.5 (1 in 10 soln) |
| Thiosulphate(S2O3): | NMT 0.1% |
| Iron(Fe): | NMT 10 mg/kg |
| Lead(Pb): | NMT 2 mg/kg |
| Selenium (Se): | NMT 5 mg/kg |
| Assay: | NLT 90.0% |
