1 | Description | Colorless crystals. | Colorless crystals or a white, crystalline powder. |
2 | Solubility | Complies | Very soluble in water, soluble in ethanol (96%). |
3 | Identification A (By Chemical test) | Complies | within a few minutes a blue precipitates should be formed or a dark blue should be developed. |
4 | Identification B (By Chemical test) | Complies | A dense white precipitate should be formed. |
5 | Identification C (By Loss on drying) | 39.6% | 39.0% - 40.5% |
6 | Appearance of solution | Complies | Solution A should be clear and colorless. |
7 | pH(5% aq soln) | 8.1 | 7.5-9.0 |
8 | Reducing substances | Complies | The pink color should persist for at least 1 hour. |
9 | Chloride(Cl) | Less than 200ppm | NMT 200ppm |
10 | Sulphate(SO4) | Less than 200ppm | NMT 200ppm |
11 | Arsenic(As) | Less than 2ppm | NMT 2ppm |
12 | Calcium(Ca)&Magnesium(Mg) | 16ppm | NMT 50ppm (NMT 0.65ml of 0.02 M sodium edetate is required) |
13 | Heavy metals | Less than 10ppm | NMT 10ppm |
14 | Iron(Fe) | Less than 10ppm | NMT 10ppm |
15 | Loss on drying at 130°C | 39.6% | 39.00%-40.5% |
16 | Assay (on dried basis) | 99.8% | 99.00% - 101.00% |