1 | Description | A white crystalline powder | A white, crystalline powder or small, opaque, monoclinic crystals. |
2 | Solubility | Passes | Freely soluble in water; practically insoluble in ethanol (95%). |
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) | Complies | Solution A gives the reactions of sodium salts |
6 | Appearance of Solution | Passes | Solution A is clear and colourless |
7 | Arsenic (As) | NMT 2 ppm | NMT 2ppm |
8 | Calcium (Ca) | Passes | A 2.0%w/v solution should be clear when boiled for 5 minutes. |
9 | Heavy metals | NMT 5 ppm | NMT 5ppm |
10 | Iron (Fe) | NMT 20 ppm | NMT 20ppm |
11 | Carbonate | 8.45 | pH should not more than 8.6 |
12 | Chlorides | NMT 200 ppm | NMT 200ppm |
13 | Sulphate (SO4) | NMT 150 ppm | NMT 150ppm |
14 | Assay | 99.95% | NLT 99.0% and NMT 101.0% |