1 | Appearance | A white fine powder, hygroscopic. | A white or colourless or almost white, slightly granular or fine powder, hygroscopic. |
2 | Solubility | Passes | Freely soluble in water, more soluble in boiling water practically insoluble in ethanol (96%) |
3 | Identification(Sodium) | Complies | A dense whiter precipitate should form. |
4 | Identification (Carbonate 1) | Complies | Effervesce with acids, evolves a colorless gas that when pass into calcium hydroxide solution produces white precipitate immediately |
5 | Identification (Carbonate 2) | Complies | A cold solution should be colored red by phenolphthalein solution |
6 | Identification (Carbonate 3) | Complies | A white precipitate should form that dissolves on addition of an excess of hydrochloric acid |
7 | Identification (By chemical test) | Complies | The solution should be strongly alkaline. |
8 | Identification (By Loss on drying) | 0.34% | 1.0% max |
9 | Appearance of Solution | Passes | The solution should be clear and not more intensely colored than reference solution Y6. |
10 | Alkali hydroxides & bicarbonates | Passes | The solution should remain clear. |
11 | Chloride (Cl) | Less than 125ppm | Not more than 125ppm |
12 | Sulphate(SO4) | Less than 250ppm | Not more than 250ppm |
13 | Arsenic (As) | Less than 5ppm | Not more than 5ppm |
14 | Iron(Fe) | Less than 50ppm | Not more than 50ppm |
15 | Loss on drying | 0.34% | 1.0% w/w |
16 | Water | 0.3% | 0.5% max |
17 | Assay (Dried substance) | 99.94% | 99.50% to 100.50% |
18 | Particle size | 100% material passes through 40# | 100% of the material should pass through 40# |