# What is the oxidation number for KCLO_3?

Aug 23, 2016

The oxidation number of chlorine in $\text{potassium chlorate}$, $K C l {O}_{3}$, is $+ V$.

#### Explanation:

And the oxidation number of chlorine in $\text{potassium perchlorate}$, $K C l {O}_{4}$, is..........?

For the chlorate, we know the salt is a neutral compound. The oxidation numbers must thus sum to zero. Potassium generally has an oxidation number of $+ I$, and it does so here; oxygen generally has an oxidation number of $- I I$ and it does so here. So simply the sum the oxidation numbers:

For $K C l {O}_{3}$, $I + 3 \times \left(- I I\right) + C {l}^{\text{oxidation number}} = 0$.