Balance this equation \[ \mathrm{MnO}_{2}(s)+\mathrm{I}(a q) \longrightarrow \mathrm{Mn}^{2+}(a q)+\mathrm{I}_{2}(s) \] in acidic solution. \[ \mathrm{MnO}_{2}(s)+\mathrm{I}^{-}(a q) \longrightarrow \mathrm{Mn}^{2+}(a q)+\mathrm{I}_{2}(s) \]
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