1 | Appearance | White crystalline powder | White or almost white, crystalline powder, colourless crystals or granules. |
2 | Solubility | Passes | Very soluble in water, freely soluble in ethanol (96%) |
3 | Melting point | 154°C | About 153°C, with decomposition. |
4 | Identification A (By Chemical test) | Complies | The solution is strongly acidic. |
5 | Identification B (By IR) | Complies | To Comply the test |
6 | Identification C (By Chemical test) | Complies | A red colour develops. |
7 | Identification D (By Chemical test) | Complies | A white precipitate is formed. |
8 | Identification E (By Water) | Complies | To Comply the test |
9 | Appearance of Solution | Complies | The solution is clear and colourless or not more intensely coloured than reference solution Y7, BY7 or GY7. |
10 | Readily carbonizable substances | Complies | The solution is not more intensely coloured than a mixure of 1ml of red primary solution and 9ml of yellow primary solution. |
11 | Oxalic acid | NMT 360ppm | 360ppm (Calculated as anhydrous oxalic acid) |
12 | Sulfates | NMT 150ppm | 150ppm max |
13 | Water | 0.38% | 1.0% max |
14 | Sulphated ash | 0.02% | 0.1% max |
15 | Assay (Anhydrous basis) | 99.95% | 99.50%-100.50% |