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4 January, 06:05

The button batteries in small devices like watches are commonly composed of silver-zinc or mercury-zinc batteries. The reaction in a mercury button battery is: HgO (s) + Zn (s) - -> ZnO (s) + Hg (l) What is the line notation for a mercury button battery?

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  1. 4 January, 07:37
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    The mercury button battery line notation is:

    Zn⁰| Zn²||, HgO| Hg⁰||

    Explanation:

    Mercury batteries either use

    pure mercury (II) oxide (HgO) - which is called mercuric oxide

    or a mixture of HgO with manganese dioxide (MnO2) which is as the cathode.

    Anode has two half reactions:

    The first step is an electrochemical reaction step:

    Zn + 4OH - → Zn (OH) 4-2 + 2e-[3]

    cathode has a half reaction:

    HgO + H2O + 2e - → Hg + 2OH-[3]

    +0.0977 V standard potential is of this reaction.

    which is followed by a chemical reaction step:

    Anode consists of oxidation:

    Zn+2OH>ZnO+H2O+2e

    which gives an overall anode half-reaction of:

    Zn + 2OH - → ZnO + H2O + 2e-[3]

    Therefore,

    The overall reaction for the battery is:

    Zn + HgO → ZnO + Hg
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