How do you determine the oxidation number of nitrogen in the nitrate ion?
The important rules here are:
- The oxidation number of oxygen in a compound is usually -2, except in peroxides, where it is -1.
- The sum of all the oxidation numbers in a polyatomic ion is equal to the charge on the ion.
The formula of nitrate ion is
Rule 1 tells us that the oxidation number of
Rule 2 tells us that the sum of all the oxidation numbers equals the charge on the ion.
∴ The oxidation number of