Answer
$6H^{+}(aq) + ClO^{-}_{3} (aq) + 6e^{-} → Cl^{-} (aq) + 3H_{2}O(l)$
Work Step by Step
We add water on the right hand side and H on the left hand side to balance the equation. Since Chlorine is going from oxidation state of +5 to -1, this is a reduction reaction.
