1 | Appearance/Description | Colorless, translucent crystals | Colorless, translucent crystals; white or almost white granular to fine crystalline powder |
2 | Solubility | Complies | Very soluble in water, freely soluble in ethanol (96%),very slightly soluble in ether. |
3 | Melting point | 152°C | About 153°C, with decomposition. |
4 | Identification (By IR) | Complies | IR spectra of the sample should be concomitant with IR spectra of standard |
5 | Identification (By chemical test 1) | Complies | The solution should be strongly acidic. |
6 | Identification (By chemical test 2) | Complies | A red colour should develop. |
7 | Identification (By chemical test 3) | Complies | A white precipitate should form. |
8 | Identification (By Water) | 0.06% | NMT 1.0% |
9 | Appearance of Solution | Complies | The solution should be clear and colourless or not more intensely coloured than reference solution Y7, BY7 or GY7. |
10 | Clarity of solution | Complies | The sample solution should show the same clarity as that of water or its opalescence is not more pronounced than standard suspension. |
11 | Colour of solution | Complies | The sample solution should not more intensely colored than standard solutions |
12 | Readily carbonizable substances | Complies | The solution should not be more intensely coloured than reference standard |
13 | Oxalic acid | Less than 360ppm | NMT 360ppm |
14 | Sulfates | Less than 150ppm | NMT 150ppm |
15 | Water | 0.06% | NMT 1.0% |
16 | Sulphated ash / Residue on ignition | 0.03% | NMT 0.1% |
17 | Assay (Anhydrous basis) | 99.8% | 99.5%-100.5% |