# Question #5256c

Nov 2, 2015

${\text{KMnO}}_{4}$

#### Explanation:

Potassium permanganate is an ionic compound, which means that it will contain a cation, or positively charged ion, and an anion, or negatively charged ion.

You know that potassium, which is the cation, since it's used first in the name of the compound, is ${\text{K}}^{+}$.

The maganate ion, or ${\text{MnO}}_{4}^{2 -}$, is an oxyanion that contains manganese in the $\textcolor{b l u e}{+ 6}$ oxidation state.
In this case, the permanganate anion would be ${\text{MnO}}_{4}^{-}$. Here manganese is in the $\textcolor{b l u e}{+ 7}$ oxidation state. Despite the fact that you still get $4$ oxygen atoms, the charge of the anion is now $1 -$, which means that you have moer oxygen atoms per unit of charge than in the manganate anion.
Therefore, the chemical formula for potassium permanganate is ${\text{KMnO}}_{4}$.