1 | Description | Colourless crystals; hygroscopic. | Colourless crystals; hygroscopic. |
2 | Solubility | Complies | Very soluble in water; freely soluble in ethanol (95%). |
3 | Identification A (By Chemical test) | Complies | A curdy white precipitate should form which is insoluble in nitric acid but soluble in Ammonia solution after well washed with water. |
4 | Identification B (By Chemical test) | Complies | A white crystalline precipitate should produce. |
5 | Appearance of Solution | Complies | A 10% w/v solution should be clear and colourless. |
6 | Acidity & alkalinity | Complies | Not more than 0.3mL of either 0.01M hydrochloric acid or 0.01M sodium hydroxide should require to change the colour of the solutioin. |
7 | Arsenic (As) | Less than 2ppm | NMT 2ppm |
8 | Heavy metals | Less than 20ppm | NMT 20ppm |
9 | Iron (Fe) | Less than 10ppm | NMT 10ppm |
10 | Calcium (Ca) | Not detected | NMT 0.1% w/w |
11 | Sulphate (SO4) | Less than 100ppm | NMT 100ppm |
12 | Assay (By Titration) | 99.8% | 98.0% to 101% w/w |