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For questions about the reduction potential (A measure of the tendency of a chemical species to acquire electrons and thereby be reduced) or its applications. Also see the tag [electrochemistry].
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Why exactly are standard potentials additive?
It helps to view this in terms of the equation
$$\Delta G^\circ = -nFE^\circ$$
Reversing the reaction reverses the sign on $\Delta G^\circ$, and therefore the sign on $E^\circ$. The sign on the potent …