1 | Appearance | White crystalline powder | White or almost white crystalline powder |
2 | Solubility | Passes | Soluble in water, practically insoluble in alcohol. |
3 | Identification A (By Chemical test) | Complies | A pale pink colour is produced. On heating gas is evolved and the solution becomes red. |
4 | Identification B (By Chemical test) | Complies | It gives reaction (A) of bicarbonates |
5 | Identification C (By Chemical test) | Passes | Solution S gives the reactions of sodium salts |
6 | Appearance of Solution | Passes | Solution S is clear and colourless |
7 | Carbonate | 8.09 | The pH of freshly prepared solution S is not greater than 8.6 |
8 | Chlorides | Less than 150ppm | 150ppm max |
9 | Sulphate (SO4) | Less than 150ppm | 150ppm max |
10 | Ammonium (NH4) | Less than 20ppm | 20ppm max |
11 | Arsenic (As) | Less than 2ppm | 2ppm max |
12 | Calcium (Ca) | Less than 100ppm | 100ppm max |
13 | Iron (Fe) | Less than 20ppm | 20ppm max |
14 | Heavy metals | Less than 10ppm | 10ppm max |
15 | Assay | 99.83% | 99.0% - 101.0% |