1 | Description | Colorless crystals. | White powder or colorless crystals. |
2 | Solubility | Complies | Freely soluble in water; practically insoluble in ethanol (96%) |
3 | Identification (By chemical test) | Complies | Solution should be slightly alkaline |
4 | Identification (By Loss on drying) | 20.3% | 19.5% - 21.0% |
5 | Identification (Sodium) | Complies | A dense precipitate should form. |
6 | Identification (Phosphate 1) | Complies | A yellow precipitate that soluble in 2N nitric acid and in 6N ammonium hydroxide should form. |
7 | Identification (Phosphate 2) | Complies | With ammonium molybdate solution, acidified solutions should yield a yellow precipitate which should soluble in 6N ammonium hydroxide. |
8 | Identification (Phosphate 3) | Complies | A yellow colour should develop. |
9 | Assay (on dry basis) | 99.1% | 98.0% - 100.5% |
10 | Assay (Dried substance) | 99.1% | 98.0% - 101.0% (Na2HPO4) |
11 | Insoluble Substances | 0.002% | NMT 0.4% |
12 | Appearance of solution | Complies | Clear and colorless solution. |
13 | Reducing substances | Complies | The color of the permanganate should not completely discharge |
14 | Monosodium Phosphate | Less than 2.5% | 2.5% max. |
15 | Chlorides | Less than 400ppm | 400ppm max |
16 | Sulphate (SO4) | Less than 0.1% | 0.1% max |
17 | Arsenic (As) | Less than 4ppm | 4ppm max |
18 | Iron(Fe) | Less than 40ppm | 40ppm max |
19 | Loss on drying,130°C | 20.3% | 19.5% - 21.0% |