| 1 | Description | White powder that readily absorbs moisture. | White powder that readily absorbs moisture. | USP |
| 2 | Solubility | Complies | Freely soluble in water; insoluble in alcohol | USP |
| 3 | Identification A (Sodium) | Complies | A dense precipitate should form. | USP |
| 4 | Identification B (Phosphate 1) | Complies | With silver nitrate solution neutral solution should yield yellow precipitate that soluble in 2N nitric acid and 6 N ammonium hydroxide. | USP |
| 5 | Identification B (Phosphate 2) | Complies | With ammonium molybdate solution, acidified solutions should yield a yellow precipitate that should soluble in 6N ammonium hydroxide. | USP |
| 6 | Assay (on dry basis) | 98.70% | 98.0% - 100.5% (Na2HPO4) | USP |
| 7 | Insoluble Substances | 0.09% | NMT 0.4% | USP |
| 8 | Chlorides | Less than 0.06% | NMT 0.06% | USP |
| 9 | Sulfate (SO4) | Less than 0.2% | NMT 0.2% | USP |
| 10 | Arsenic (As) | Less than 16 ppm | NMT 16ppm | USP |
| 11 | Loss on drying,130°C | 0.44% | NMT 5.0% | USP |