1 | Description | Colourless, translucent crystals.Efflorescent in dry air. | Colourless, translucent crystals or white granular to fine crystalline powder.Efflorescent in dry air. |
2 | Solubility | Passes | Very soluble in water, freely soluble in alcohol, very slightly soluble in ether. |
3 | Identification by Chemical test | Complies | The solution is strongly acidic. |
4 | Identification (By IR) | Complies | To Comply the test |
5 | Identification by Chemical test | Complies | A red colour develops. |
6 | Identification by Chemical test | Complies | A white precipitate is formed. |
7 | Identification (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 | Clarity of solution | Passes | 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 | Passes | 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 | 0.04% | Not more than 0.1% |
13 | Sulphate(SO4) | Less than 0.015% | 0.015% max (150 ppm max) |
14 | Limit of oxalic acid | Less than 0.036% | 0.036% max, (360 ppm max.) |
15 | Readily carbonizable substances | Passes | The color of the acid is not darker than that of a similar volume of matching fluid K . |
16 | Water | 8.5% | 7.5% to 9.0% |