1 | Appearance | Colourless crystals, efflorescent. | White or almost white, crystalline powder, colourless crystals or granules, efflorescent. |
2 | Solubility | Passes | Very soluble in water, freely soluble in ethanol (96%) |
3 | Identification A (By Chemical test) | Complies | The solution is strongly acidic. |
4 | Identification B (By IR) | Complies | To Comply the test |
5 | Identification C (By Chemical test) | Complies | A red colour develops. |
6 | Identification D (By Chemical test) | Complies | A white precipitate is formed. |
7 | Identification E (By Water) | Complies | To Comply the test |
8 | Appearance of Solution | Passes | The solution is clear and colourless or not more intensely coloured than reference solution Y7, BY7 or GY7. |
9 | Readily carbonizable substances | Passes | The solution is not more intensely coloured than a mixture of 1ml of red primary solution and 9ml of yellow primary solution. |
10 | Oxalic acid | Less than 360ppm | 360ppm (Calculated as anhydrous oxalic acid) |
11 | Sulfates | Less than 150ppm | 150ppm max |
12 | Water | 8.5% | 7.5% to 9.0% |
13 | Sulphated ash | 0.06% | Not more than 0.1% |
14 | Assay (Anhydrous basis) | 99.9% | 99.5%-100.5% |