Tuesday, 25 August 2015

electrochemistry - Deriving a reduction potential from two other reduction potentials



Given:


CoX3+(aq)+eXCoX2+(aq)E°=+1.82 VCoX2+(aq)+2eXCo(s)E°=0.28 V


what is the standard reduction potential for CoX3+(aq)+3eXCo(s)?




If I add up these two half-equations to get the desired half-equation, I get E=+1.54 V. But the correct answer is + 0.42V!


Am I missing something?




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