Nitrogen dioxide (NO2) is a molecule which contain two oxygen atom and one nitrogen atom. Oxidation number of nitrogen atom can be found by two methods, algebra method and observing structure of molecule. Oxidation number of nitrogen is important to decide to whether NO2 can be oxidized or reduced.
Therefore, oxygen gets more electrons and we call oxygen atoms gets a negative oxidation number. Also, nitrogen loses electrons and call, nitrogen atom get a positive oxidation number.
When you draw the best lewis structure of NO2, you can determine oxidation number of nitrogen atom NO2.
overall oxidation number of nitrogen in NO2 = +3 + (+1) = +4
In this method, we are going to use known oxidation numbers in thhe molecule to find out unknown oxidation number of a atom in the same molecule. Usually oxygen's most common oxidation number is -2. But, nitrogen has so many oxidation numbers from -3 to +5. Therefore, we are going to find oxidation number of nitrogen using oxidation number of oxygen atoms (-2) .
Oxidation number of nitrogen in NO2 is +4.
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Reaction between nitrogen dioxide and water: Here oxidation number of nitrogen is increased to +5 (HNO3) and reduced to +2 (NO).
The only oxidation number which is higher than in NO2 is +5. As examples, HNO3 and N2O5 caan be given.
We know nitrogen dioxide is acidic compound. Also, we know when oxidation number of an element is increased in a series of that element's oxides, acidic characteristics are increased. Nitrogen's maximum is oxidation number is +5. In nitrogen dioxide, oxidation number of nitrogen is +4 which is close to maximum oxidation number of nitrogen. Therefore, NO2 should have acidic characteristics.
Dinitrogen tetroxide (N2O4) is the oxide of nitrogen which has the same oxidation number as NO2.
Oxidation number of nitrogen in NO2 is +4. We know, nitrogen can show oxidation numbers from -3 to +5. Therefore, nitrogen atom in nitrogen dioxide has the capability of oxidizing and reducing. As an example, in the reaction of nitrogen dioxide and water reaction, nitrogen atom is oxidized to +5 oxidation state (nitric acid).
Also, because oxidation number of nitrogen is high positive value (+4), NO2 is an acidic oxide of nitrogen
Oxidation number of N in NO2 is +4. NO2 is an example for +4 oxidation state of nitrogen. Due +4 oxidation number, NO2 is an acidic gas. Usually, when an oxide of an element's oxidation number increases, acidic characteristics increases.