The nitrate ion is a polyatomic ion with the empirical formula NO3- and a molecular mass of 62.0049. It is the conjugate base of nitric acid, consisting of one central nitrogen atom surrounded by three identical oxygen atoms in a trigonal planar arrangement. The nitrate ion carries a formal charge of negative one, where each oxygen carries a -2/3 charge while the nitrogen carries a +1 charge, and is commonly used as an example of resonance.
| Formula. | KNO3 | Appearance. | White Crystalline Powder |
| Assay. | 99.00% Min | M.W. | 101.1 |
| Chloride | 0.005% | Sulphate | 0.002% |
| PH | 6 to 7.5 | Lead | Nil |
| Iron | 0.002% | | |
table size is greater than 2000 char
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