| 1 | Description | Colorless, translucent crystals. Melts at 153°, with decomposition. | Colorless, translucent crystals or white, granular to fine crystalline powder. Melts at about 153°, with decomposition.(Note: The product may cause lumps or hardening over the storage). | USP |
| 2 | Solubility | Complies | Very soluble in water, freely soluble in alcohol, very slightly soluble in ether. | USP |
| 3 | Identification A (By IR) | Complies | IR spectra of the sample should be concomitant with IR spectra of the standard. | USP |
| 4 | Assay (Anhydrous basis) | 99.8% | 99.5%-100.5% | USP |
| 5 | Residue on ignition | 0.02% | NMT 0.1% | USP |
| 6 | Sulphate (SO4) | Less than 0.015% | NMT 0.015% | USP |
| 7 | Limit of oxalic acid | Less than 0.036% | NMT 0.036% | USP |
| 8 | Colour of solution | Complies | The sample solution should not more intensely colored than standard solutions | USP |
| 9 | Clarity of solution | Complies | The sample solution should show the same clarity as that of water or its opalescence should not be more pronounce than standard suspension. | USP |
| 10 | Readily carbonizable substances | Complies | The color of the acid should not be darker than that matching fluid. | USP |
| 11 | Water | 0.16% | NMT 1.0% | USP |