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27 August, 08:29

There are three voltaic cells. In each voltaic cell one half-cell contains a 1.0 M Fe (NO3) 2 (aq) solution with an Fe electrode. The contents of the other half-cells are as follows:Cell 1: a 1.0 M CuCl2 (aq) solution with a Cu electrodeCell 2: a 1.0 M NiCl2 (aq) solution with a Ni electrodeCell 3: a 1.0 M ZnCl2 (aq) solution with a Zn electrodeIn which voltaic cell (s) does iron act as the anode? a) Cell 1b) Cell 2c) Cell 3d) Cells 1 and 2e) All three cells

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  1. 27 August, 09:07
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    d) Cells 1 and 2

    Explanation:

    In a voltaic cell, oxidation occurs at the anode and reduction occurs at the cathode. The half cell that function as anode or cathode in a voltaic cell depends strictly on the reduction potential of the metal ion/metal system in that half cell.

    Examining the reduction potentials of the various metal ion/metal systems in the three half cells;

    Cu = + 0.34 V

    Ni = - 0.25 V

    Zn = - 0.76 V

    Fe (Fe2+) = - 0.44 V

    Hence only Zn2 + has a more negative reduction potential than Fe2+. The more negative the reduction potential, the greater the tendency of the system to function as the anode. Thus iron half cell will function as anode in cells 1&2 as explained in the argument above.
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