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Question
Write electrode reactions and overall cell reaction when Leclanche's dry cell generates electricity.
Solution
Electrode reactions are as follows:
- Oxidation at anode:
\[\ce{Zn_{(s)} -> Zn^{2+}_{ (aq)} + 2e^{-}}\] - Reduction at cathode:
\[\ce{2NH^{+}_{4(aq)} + 2MnO_{2(s)} + 2e^{-} -> Mn_2O_{3(s)} + 2NH_{3(aq)} + H_2O_{(l)}}\] - Overall cell reaction:
\[\ce{Zn_{(s)} + 2NH^+_{4(aq)} + 2MnO2 -> Zn^{2+}_{ (aq)} + Mn2O_{3(s)} + 2NH_{3(aq)} + H2O_{(l)}}\]
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