1 | Description | White granular to fine crystalline powder 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 A (By IR) | Complies | To Comply the test |
4 | Assay (Anhydrous basis) | 99.94% | 99.50%-100.50% |
5 | Residue on ignition | 0.065% | Not more than 0.1% |
6 | Heavy metals | Less than 10ppm | 10ppm max |
7 | Sulphate (SO4) | Less than 0.015% | 0.015% max |
8 | Limit of oxalic acid | Less than 0.036% | 0.036% max |
9 | Clarity of solution | Complies | The sample solution shows the same clarity as that of water or its opalescence is not more pronounced than standard suspension A. |
10 | Colour of solution | Complies | To Comply the test |
11 | Readily carbonizable substances | Complies | The color of the acid is not darker than that of a similar volumn of matching fluid K in a matching tube, the tubes being observed vertically against a white background. |
12 | Water | 0.13% | Not more than 1.0% |