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For some of the problems in Chapter 14, we have notice that when comparing two cell potentials from Appendix 2A, the lower or more negative cell potential means that half-reaction is an anode and therefore the more positive one is the cathode. However, in other questions when using Appendix 2A, sometimes the anode has a higher or more positive cell potential than the cathode. Why is this? When should we use the fact that the anode has a more negative cell potential and when should we not?
If I understand your question correctly, I think that all this means is that when you add up the cell potential of an anode (which has a positive value) and a cathode (which has a negative value), the cell will be not spontaneous (-E of the cell) and will not be a useful battery.
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