1 | Description | Colourless crystalline mass. has a characteristic odor. Gradually darkens on exposure to light and air, deliquescent. | Colorless to light pink or faintly yellowish, interlaced or separate needle-shaped crystals or white to light pink, crystalline mass. has a characteristic odor. Gradually darkens on exposure to light and air,deliquescent.. |
2 | Solubility | Complies | Soluble in water, very soluble in alcohol, in ethanol (96%) in glycerin, in chloroform, in ether, in methylene chloride and in fixed and volatile oils; sparingly soluble in mineral oil. |
3 | Identification (By chemical test 1) | Complies | A white precipitate should form which should dissolve at first but become permanent as more of the reagent add |
4 | Identification (By chemical test 2) | Complies | A blue color should develop and become progressively more intense |
5 | Identification (By chemical test 3) | Complies | A violet color should produce which should disappear on addition of 2-propanol |
6 | Assay (on Anhydrous basis) | 99.7% | 99.0%-100.5% |
7 | Limit of Nonvolatile residue /Residue on evaporation | 0.02% | NMT 0.05%; NMT 2.5mg |
8 | Clarity of solution and reaction | Complies | A solution is clear and is neutral or acid to litmus paper. |
9 | Appearance Solution | Complies | Solution should be clear and not more intensely coloured than reference solution B6 |
10 | Acidity | Complies | Yellow solution. |
11 | Congealing temperature | 40°C | NLT 39°C |
12 | Freezing point | 41.0°C | NLT 39.5°C |
13 | Water | 0.1% | NMT 0.5% |