1 | Description | A white , slightly granular powder, hygroscopic. | A white or almost white, slightly granular powder,hygroscopic. |
2 | Solubility | Complies | Freely soluble in water; practically insoluble in ethanol (95%). |
3 | Identification A (By Chemical test) | Complies | The solution should be strongly alkaline. |
4 | Identification B (carbonate) | Complies | A white precipitate that dissolves on addition of excess dilute hydrochloric acid should form. |
5 | Identification B (Sodium A) | Complies | A dense white precipitate should form. |
6 | Identification B (Sodium B) | Complies | No precipitate should form. |
7 | Appearance of solution | Complies | The solution should be clear and not more intensely colored than reference solution YS6. |
8 | Alkali hydroxides and bicarbonates | Complies | The solution remains clear. |
9 | Heavy metals | Less than 50ppm | NMT 50ppm |
10 | Iron (Fe) | Less than 50ppm | NMT 50ppm |
11 | Chlorides | Less than 125ppm | NMT 125ppm |
12 | Sulfates | Less than 250ppm | NMT 250ppm |
13 | Loss on drying,300°C | 0.3% | NMT 1.0% |
14 | Assay (on dried basis) | 99.9% | 99.5% - 100.5% |