CASR |
: | 7558-79-4 |
Molecular Formula |
: | Na2HPO4 |
Molecular Weight |
: | 141.96 |
| Specifications | |
|---|---|
| Appearance/Description: | White powder that readily absorbs moisture and free from visible extraneous matter |
| Solubility: | Freely soluble in water; insoluble in alcohol |
| Identification (By chemical test): | Solution should slightly alkaline |
| Identification (By Loss on drying): | NMT 1.0% |
| Identification (Sodium): | A dense precipitate should form |
| Identification (Phosphate 1): | With silver nitrate solution neutral solution should yield yellow precipitate that soluble in 2N nitric acid and 6 N ammonium hydroxide |
| Identification (Phosphate 2): | With ammonium molybdate solution, acidified solutions should yield a yellow precipitate that should soluble in 6N ammonium hydroxide |
| Identification (Phosphate 3): | A yellow colour should develop |
| Assay (on dry basis): | 98.0% - 100.5% |
| Assay (on dried basis): | 98.0% - 101.0% |
| Monosodium Phosphate: | NMT 2.5% |
| Water insoluble substances: | NMT 0.05% |
| Appearance of solution: | Solution should be clear and colourless |
| Chlorides: | NMT 0.001% |
| Chlorides (Cl): | NMT 200 ppm |
| Sulfate: | NMT 0.01% |
| Sulfates (SO4): | NMT 500 ppm |
| Arsenic: | NMT 2ppm |
| Reducing substances: | The solution should remain purplish red colour |
| Iron(Fe): | NMT 0.002% |
| Loss on drying at 130°C: | NMT 1.0% |
| Loss on drying (105 °C, 4 hrs): | NMT 1.0% |
| Alkalinity: | 9.0-9.4 |
| Carbonate: | No effervescence should produce |
