1 | Description | Colorless, crystalline powder is odorless and is slightly deliquescent. Its solutions are acid to litmus and effervesce with sodium carbonate | Colorless crystals or white, crystalline powder is odorless and is slightly deliquescent. Its solutions are acid to litmus and effervesce with sodium carbonate |
2 | Solubility | Complies | very soluble in water; practically insoluble in alcohol. |
3 | Identification A (By Chemical test) | Complies | Solution should be slightly acid |
4 | Identification A (Sodium) | Complies | A dense whiter precipitate should form |
5 | Identification (Phosphate 1) | Complies | A neutral solution should yield yellow precipitate that soluble in 2N nitric acid and 6 N ammonium hydroxide |
6 | Identification (Phosphate 2) | Complies | A yellow precipitate should form of which color does not changes by boiling and which dissolves on addition of ammonia. |
7 | Identification (Phosphate 3) | Complies | A yellow color should develop |
8 | Appearance of solution | Complies | Clear and colorless solution |
9 | pH | 4.39 | 4.2 - 4.5 |
10 | Insoluble Substances | 0.05% | NMT 0.2% |
11 | Chlorides | Less than 0.014% | NMT 0.014% |
12 | Sulphate (SO4) | Less than 300ppm | 300ppm max |
13 | Aluminium, Calcium and Related Elemant | Complies | The sample solution should not become turbid when rendered slightly alkaline to litmus paper with 6N ammonium hydroxide. |
14 | Water | 23.2% | 18.0% - 26.5% |
15 | Loss on drying,130°C | 23.5% | 21.5% - 24.0% |
16 | Reducing substances | Complies | The color of permanganate should not completely discharge |
17 | Arsenic (As) | Less than 2ppm | 2ppm max |
18 | Iron (Fe) | Less than 10ppm | 10ppm max |
19 | Assay (on dried basis) | 100.0% | 98.0% - 100.5% |