For aqueous basic conditions

CHEMISTRY · Subjective · A Level · Chemistry · Oxidation, reduction and redox reactions · Oxidation, reduction and redox reactions

Problem

For aqueous basic conditions, use the two half-reactions provided to write the balanced overall redox equation. (i)

\mathrm{Zn} + 4\,\mathrm{OH}^{-} \to \mathrm{Zn(OH)}_{4}^{2-} + 2\,\mathrm{e}^{-}

(ii)

\mathrm{O}_{2} + 2\,\mathrm{H}_{2}\mathrm{O} + 4\,\mathrm{e}^{-} \to 4\,\mathrm{OH}^{-}