CASR |
: | 7558-79-4 |
Molecular Formula |
: | Na2HPO4 |
Molecular Weight |
: | 141.96 |
| Specifications | |
|---|---|
| Appearance/Description: | White powder that readily absorbs moisture. |
| 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 (Dried substance): | 98.0% - 101.0% |
| Assay (acidimetric, on dried basis): | 99.0 - 101.0% |
| Appearance of solution: | Solution should be clear and colourless. |
| Insoluble Substances: | NMT 0.20% |
| Sodium dihydrogen phosphate: | NMT 2.5% |
| pH- value (1%, water): | 9.0 - 9.4 |
| Carbonate: | The solution should not effervesce. |
| Chlorides: | NMT 0.01% |
| Fluoride(F): | NMT 0.001% |
| Sulphate (SO4): | NMT 0.03% |
| Heavy metals (as Pb): | NMT 0.001% |
| Arsenic (As): | NMT 0.0001% |
| Cadmium(Cd): | NMT 0.0001% |
| Iron(Fe): | NMT 0.002% |
| Mercury(Hg): | NMT 0.0001% |
| Nickel (Ni): | NMT 0.0002% |
| Lead (pb): | NMT 0.0001% |
| Reducing substances(kmno4): | The colour of the permanganate should not be completely discharge. |
| Loss on drying at 130°C: | NMT 1.0% |
| Particle size (> 0.315 mm): | about 99.0% |
