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It's convention for the anode to be on the left and the cathode to be on the right, Anode||Cathode. If the cell diagram is given in a problem, or it asks you to construct a cell diagram, then you can assume that the diagram will follow this convention. This is particularly important when given a cell diagram and asked to write the oxidation half-reaction and reduction half-reaction because the species on each side of the salt bridge do not have to be listed in order of reactant to product. In this case, it would be important to determine whether the charges increase or decrease from reactant to product since convention lets you know which species should be oxidized and which should species should be reduced.
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