Mercuric oxide dry-cell batteries are often used where a flat discharge voltage and long life are required, such as in watches and cameras. The two half-cell reactions that occur in the battery are HgO1s2 + H2O1l2 + 2 e- ¡ Hg1l2 + 2 OH-1aq2 Zn1s2 + 2 OH-1aq2 ¡ ZnO1s2 + H2O1l2 + 2 e- Why is the potential of the anode reaction diferent than would be expected if the reaction occurred in an acidic medium?

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