1 | Description | Colourless, translucent, crystals, efflorescent. | Colourless, translucent crystals or white or almost white granular to fine crystalline powder, efflorescent. |
2 | Solubility | Complies | Very soluble in water, freely soluble in alcohol and ethanol(96%), very slightly soluble in ether, |
3 | Identification (By chemical test 1) | Complies | The solution is strongly acidic. |
4 | Identification (By IR) | Complies | IR spectra of the sample should be concomitant with IR spectra of the corresponding standadrd |
5 | Identification (By chemical test 2) | Complies | A red colour should develop. |
6 | Identification (By chemical test 3) | Complies | A white precipitate should form. |
7 | Identification (By Water) | 8.8% | 7.5% to 9.0% |
8 | Appearance of Solution | Complies | The solution is clear and colourless or not more intensely coloured than reference solutions |
9 | Clarity of solution | Complies | The sample solution shows the same clarity as that of water or its opalescence should not more pronounced than standard suspension A |
10 | Colour of solution | Complies | The sample solution should not be more intensely colored than water or standard solutions |
11 | Assay (anhydrous basis) | 99.9% | 99.5%-100.5% |
12 | Residue on ignition /Sulfated ash | 0.02% | NMT 0.1% |
13 | Sulphate (SO4) | Less than 0.015% | NMT 0.015% (NMT 150 ppm) |
14 | Oxalic acid | Less than 0.036% | NMT 0.036% (NMT 360 ppm) |
15 | Readily carbonizable substances | Complies | The color of the acid should not be darker than that of a similar volume of reference standards |
16 | Water | 8.8% | 7.5% to 9.0% |
17 | Bacterial endotoxin test | Less than 0.5 EU/mg | NMT 0.5 EU/mg |