Question

when added to a solution containing a carbon - carbon double or triple bond, potassium permanganate changes from purple to brown. write the chemical formula for potassium permanganate. refer to a periodic table and a list of polyatomic ions.

Explanation:

Step1: Identify ions

Potassium ion is $K^+$ and permanganate ion is $MnO_4^-$.

Step2: Balance charges

To balance the charges in the compound, one $K^+$ and one $MnO_4^-$ combine.

Answer:

$KMnO_4$