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If you're given the 2 half reactions and their standard cell potentials for a couple do you always make the reaction with the more positive standard cell potential the anode because when you flip it it will become negative and when plugged into the equation it still makes the overall standard cell potential positive?
For a galvanic cell, you will have to flip the standard cell potential that will make E cell positive. There may be other reactions, however, where the question will give you the overall reaction and that reaction forces you to have a negative E cell.
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