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The nitrate ion with the partial charges shown. The nitrate anion is the conjugate base of nitric acid, consisting of one central nitrogen atom surrounded by three identically bonded oxygen atoms in a trigonal planar arrangement. The nitrate ion carries a formal charge of −1.
Formal charges in ozone and the nitrate anion. In chemistry, a formal charge (F.C. or q*), in the covalent view of chemical bonding, is the hypothetical charge assigned to an atom in a molecule, assuming that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity.
The formal oxidation state of the nitrogen atom in nitrite is +3. This means that it can be either oxidized to oxidation states +4 and +5, or reduced to oxidation states as low as −3. Standard reduction potentials for reactions directly involving nitrous acid are shown in the table below: [4]
In terms of Lewis structures, formal charge is used in the description, comparison, and assessment of likely topological and resonance structures [7] by determining the apparent electronic charge of each atom within, based upon its electron dot structure, assuming exclusive covalency or non-polar bonding.
4 Hydrogen sulfate ion (bisulfate ion) HNO 3 Nitric acid: NO − 3 Nitrate ion H 3 O + Hydronium ion H 2 O Water: HSO − 4 Hydrogen sulfate ion SO 2− 4 Sulfate ion H 3 PO 4 Phosphoric acid: H 2 PO − 4 Dihydrogen phosphate ion CH 3 COOH Acetic acid: CH 3 COO − Acetate ion HF Hydrofluoric acid: F − Fluoride ion H 2 CO 3 Carbonic acid ...
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As an example, summing bond orders in the ammonium cation yields −4 at the nitrogen of formal charge +1, with the two numbers adding to the oxidation state of −3: The sum of oxidation states in the ion equals its charge (as it equals zero for a neutral molecule). Also in anions, the formal (ionic) charges have to be considered when nonzero.
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