A graduate student is trying to develop a flow battery based on aqueous solutions of 1 M Cu2(SO4) and Fe(SO4) (recall that the sulfate is divalent, e.g. (SO4)-2 and assume complete solubility). Given a chart like this : CHART How would I know that I need to select Copper (I) and Iron (II) as my anode and cathode, respectively? I haven't taken chemistry before, so if anyone can explain in a concise way I'd really appreciate it. Thanks!