Understanding Oxidation States
* Oxidation state (or oxidation number) is a hypothetical charge assigned to an atom in a molecule or ion. It helps track the transfer of electrons in chemical reactions.
* Rules for Assigning Oxidation States:
* The oxidation state of an element in its elemental form is 0.
* The sum of the oxidation states in a neutral molecule is 0.
* The sum of the oxidation states in a polyatomic ion equals the charge of the ion.
* Group 1 elements (like Li) have an oxidation state of +1.
* Oxygen typically has an oxidation state of -2 (except in peroxides, where it's -1).
Applying the Rules to LiNO₂
1. Li (Lithium): Lithium is in Group 1, so its oxidation state is +1.
2. O (Oxygen): Oxygen typically has an oxidation state of -2. Since there are two oxygen atoms, their total contribution is -4.
3. N (Nitrogen): Let's represent the oxidation state of nitrogen as "x".
4. Overall Charge: The molecule LiNO₂ is neutral, so the sum of the oxidation states must be 0.
Equation:
+1 (Li) + x (N) + (-4) (O) = 0
Solving for x:
x - 3 = 0
x = +3
Therefore, the oxidation state of nitrogen in LiNO₂ is +3.
