1 | Appearance | A white powder, hygroscopic. | A white or almost white, slightly granular powder,hygroscopic. |
2 | Solubility | Passes | Freely soluble in water, practically insoluble in ethanol (96%) |
3 | Identification A (By Chemical test) | Complies | The solution should be strongly alkaline. |
4 | Identification B (carbonate) | Complies | A white precipitate should form that dissolves on addition of an excess of hydrochloric acid |
5 | Identification C (for Sodium) | Complies | A dense white precipitate should form. |
6 | Identification D (By Loss on drying) | 0.7% | 1.0% max |
7 | Appearance of solution | Passes | The solution should be clear and not more intensely colored than reference solution Y6. |
8 | Alkali hydroxides and bicarbonates | Complies | The solution should remain clear. |
9 | Chlorides | Less than 125ppm | 125 ppm max. |
10 | Sulfates | Less than 250ppm | 250 ppm max. |
11 | Arsenic (As) | Less than 5ppm | 5 ppm max. |
12 | Iron (Fe) | Less than 50ppm | 50 ppm max. |
13 | Loss on drying | 0.7% | 1.0% max |
14 | Assay (Dried substance) | 99.9% | 99.5% - 100.5% |