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Magnesium sulphate is an inorganic salt with the formula MgSO4(H2O)x where 0≤x≤7. It is often encountered as the heptahydrate sulphate mineral epsomite (MgSO4•7H2O), commonly called as Epsom salt. Magnesium sulphates are common minerals in geological environments. Their occurrence is mostly connected with supergene processes. Some of them are also important constituents of evaporite potassium-magnesium (K-Mg) salts deposits.
| Sr. No | Parameters | Unit | Specified value |
|---|---|---|---|
| 1 | Description | Visual observation | White crystalline or brilliant crystals |
| 2 | Appearance of 10% solution (By visual observation) | % w/v | Solution in water should be clear & colourless |
| 3 | pH(5% aqueous solution) | % w/v | 5.0 – 8.2 |
| 4 | Assay ( On dried basis) | % w/w | Min. 99.0 % |
| 5 | Magnesium (as Mg) | % w/w | Min. 9.7% |
| 6 | Acidity or alkalinity | % w/w | NMT 0.2 ml of 0.01M NaOH/HCl is required to change colour |
| 7 | Loss on drying (400°C) | % w/w | 48.0 – 52.0 % |
| 8 | Chloride (as Cl) | % w/w | Max 0.005 % |
| 9 | Iron (as Fe) | % w/w | Max 0.001 % |
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