CAS NO: 7757-79-1
MOLECULAR FORMULA :- KNO3
MOLECULAR WEIGHT :- 101.1g/mol
| SPECIFICATION | BP | USP |
| Description | White or almost white, crystalline powder or colorless crystals. | White or almost white, crystalline powder or colorless crystals. |
| Solubility | Freely soluble in water, very soluble in boiling water, practically insoluble in ethanol (96 %) | – |
| Identification
A. Reaction B. Reaction |
A. It gives reaction of nitrates.
B. It gives reaction of Potassium |
A. It gives reaction of nitrates.
B. It gives reaction of Potassium |
| Acidity or Alkalinity | NMT 0.5 ml of 0.01 M HCl or 0.01 M NaOH is required to change the color of the indicator. | – |
| Reducible Substances | The solution does not become blue within 2 min. | – |
| Chlorides | NMT 20 ppm | NMT 300 ppm |
| Sulfates | NMT 150 ppm | NMT 1000 ppm |
| Limit of Nitrite | – | NMT 5 ppm |
| Heavy metals | – | NMT 20 ppm |
| Arsenic | – | NMT 3 ppm |
| Lead | – | NMT 10 ppm |
| Ammonium | NMT 100 ppm | – |
| Calcium | NMT 100 ppm | – |
| Iron | NMT 20 ppm | NMT 10 ppm |
| Residual Solvents | – | Meets the requirements. |
| Sodium | NMT 1000 ppm | NMT 1000 ppm |
| Loss on Drying | NMT 0.5 % | – |
| Assay | 99.0 %-101.1 % (on dried basis) | 99.0 %-100.5 % |
Potassium nitrate is a naturally occurring mineral source of nitrogen. In plants, this compound has been tested to alleviate NaCl stress symptoms. Mechanistic studies suggest that this may be achieved through reduction of electrolyte leakage, malondialdehyde and soluble sugar contents and improving the activities of antioxidant enzymes.
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