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% |