OK let's talk cells.
EMF to be specific. How do you know which way things are going to go?
It all comes down to EMF. The EMF, just to remind you, is that thing you work out where you draw the cell put in the the Eo values, go against one and with the other and eventually you get a voltage. Remember? If not, go revise.
EMF = positive --> electrons flow left to right --> right electrode is positive (because electrons flow towards the positive)
EMF = negative --> electrons flow right to left --> left electrode is positive (because electrons flow towards the positive)
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