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Since the reactions in Galvanic cells are spontaneous and Eocell = Eocathode - Eoanode, the reaction with the more positive (or less negative) standard reduction potential should be at the cathode so that Eocell > 0.
But in a case in which you were unsure, you can always refer to the written reaction to determine which reactant is being oxidized and which is being reduced. This will help you find out which side is the anode or cathode ("redcat").
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