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It depends on the half reactions and whether or not that is considered an anode or a cathode reaction as at the anode there is oxidation and at the cathode there is reduction but the main reason anodes are written on the left and cathodes on the right is to stay consistent with the cell diagram notation.
on page 550 of the book there is an example where the cathode and anode have flipped sides in the diagram. In class I believe Dr. Lavelle said to look at which one is being reduced and which one is being oxidized and that will tell you which one is the anode/cathode.
I believe that most of the time, the cell will have this layout, but there are instances where it can be the other way around, so it’s important to pay attention to what is being oxidized and what is being reduced in each individual case instead of assuming.
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