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 develops. |
6 | Identification (By chemical test 3) | Complies | A white precipitate is formed. |
7 | Identification (By Water) | 8.5% | 7.5% to 9.0% |
8 | Appearance of solution | Complies | The solution is clear and colourless or not more intensely coloured than reference solution Y7, BY7 or GY7. |
9 | Clarity of solution | Complies | The sample solution shows the same clarity as that of water or its opalescence is not more pronounced that standard suspension A. |
10 | Colour of solution | Complies | The sample solution is not more intensely colored than water or standard solutions A, B, and C . |
11 | Assay (Anhydrous basis) | 99.8% | 99.5% - 100.5% |
12 | Residue on ignition /Sulfated ash | 0.06% | NMT 0.1% |
13 | Sulphate(SO4) | Less than 0.015% | NMT 0.015% (NMT 150 ppm) |
14 | Limit of 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 matching reference solution A (fluid K) or reference solution B. |
16 | Water | 8.5% | 7.5% to 9.0% |