Question #151120
Mercury cell is used for pacemakers, hearing aids, electric watches, and light meters. The reactions involved are:
Oxidation: Zn → ZnO Reduction: HgO → Hg

Complete and balance the half reactions in basic basic medium since the electrolye used in mercury cell is KOH. Give the overall balanced equation.
1
Expert's answer
2020-12-21T03:31:29-0500

balanced Oxidation: 

Zn + 2OH– → ZnO + H2O + 2e–

balanced Reduction:

HgO + H2O + 2e → 2OH– + Hg


overall balanced equation: 

Zn + HgO → Hg + ZnO


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