Given:
\begin{align} \ce{Co^{3+}(aq) + e- &-> Co^{2+}(aq)} & E° &= \pu{+1.82 V} \\ \ce{Co^{2+}(aq) + 2e- &-> Co(s)} & E° &= \pu{-0.28 V} \end{align}
what is the standard reduction potential for \ce{Co^{3+}(aq) +3e- -> Co(s)}?
If I add up these two half-equations to get the desired half-equation, I get E^\circ = \pu{+1.54 V}. But the correct answer is \pu{+ 0.42 V}!
Am I missing something?
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