1 | Description | White 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) | 20.1% | 19.5%- 21.0% |
5 | Identification (Sodium) | Complies | A dense precipitate should form. |
6 | Identification (Phosphate 1) | Complies | A yellow precipitate that solution 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 | 0.03% | 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% | NMT 2.5% |
15 | Chlorides | Less than 400ppm | NMT 400ppm |
16 | Sulphate (SO4) | Less than 0.1% | NMT 0.1% |
17 | Arsenic (As) | Less than 4ppm | NMT 4ppm |
18 | Iron(Fe) | Less than 40ppm | NMT 40ppm |
19 | Loss on drying,130°C | 20.1% | 19.5 - 21.0% |