1 | Appearance | White powder. On exposure to light it gradually darkens. In the dry state, is reasonably stable in air, but in solution rapidly oxidises. Melts 190°C | White or slightly yellow crystal or powder.On exposure to light it gradually darkens. In the dry state, is reasonably stable in air, but in solution rapidly oxidises. Melts about 190°C . |
2 | Solubility | Passes | Freely soluble in water; spairingly soluble in alcohol; insoluble in chloroform, in ether, and in benzene. |
3 | Identification A (By IR) | Complies | The IR absorption spectra of a substance should concomitant with the corresponding reference standard/working standard. |
4 | Identification B (By chemical test) | Complies | The solution should reduce slowly at room temperature but not more readily upon heating. |
5 | Assay | 99.3% | 99.0% - 100.5% |
6 | Residue on ignition | 0.07% | 0.1% max. |
7 | Optical Rotation | +20.7° | +20.5° to +21.5° |