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I'm a bit confused about why a more negative standard reduction potential makes a metal a better reducing agent. I thought that negative cell reduction potentials make a redox reaction non-spontaneous, so you would want your cathode to be more positive.
Metals that are reducing agents are in the anode, as they themselves are becoming oxidized, which occurs in the anode. Thus, you want these metals to have a more negative standard reducing potential, as this will make the Ecell more positive, from the relationship: Ecell=Ecathode-Eanode (you want to have a more negative Eanode in order to have a more positive Ecell-thus stronger reducing agents have a more negative standard reducing potential).
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