Sodium hyposulfite
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| Chemical formula: | Na2S2O4 |
| Application: | as a strong reducing agent it is used in dyeing, for obtaining soluble leuco compounds during cloth dyeing with insoluble colours (so called vat dyes); alkaline solutions of sodium hyposulfite are used for the oxygen absorption in gas analysis; it is also used for obtaining rongalit (acting with formic acid) which is also used in dyeing, especially for cloth printing; it has many other applications such as bleaching agent (spinning materials bleaching, defective dyeing removing, old material discolouring, raw chemical paper - pulp bleaching, bleaching of molasses, soap, glue, vegetable oils and clays), ore flotation or purification of sewage and exhaust gases; lately it has found an usage in pharmaceutical industry to produce some medicaments |
| Packing: | metal barrels of 50kg (netto) |
| Form | White cristals |
| Smell | Faint odour of SO2 |
| Solubility in water, g/l (25°C) | 190 |
| Solubility in alcohols | Insoluble |
| Solubility in ethylene and propylene glycols | Slightly soluble |
| Density kg/l | 0.90 - 0.95 |
| Na2S2O4 | 90 % ± 1 |
| Na2S2O5 | 6,5 % max |
| Na2S2O3 | 0,8 % max |
| Na2CO3 | 3,0 % max |
| Zn | 0,0005 % max |
| Fe | 0,0010 % max |
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