In each of the cells above, identify the half reaction that is being oxidized and reverse it.   Make sure each half reaction has the same number of electrons by multiplying one of the half reactions all the way through with the appropriate number if needed.   Then combine it with the other half reaction to give the overall electrochemical reaction for the cell.  Remember to balance the overall equations, and then cancel out anything that appears on both sides of the overall reaction.

Chemistry
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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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In each of the cells above, identify the half reaction that is being oxidized and reverse it.  

Make sure each half reaction has the same number of electrons by multiplying one of the half reactions all the way through with the appropriate number if needed.  

Then combine it with the other half reaction to give the overall electrochemical reaction for the cell.  Remember to balance the overall equations, and then cancel out anything that appears on both sides of the overall reaction.

 

  1. Al3+   +   3 e-    →    Al   Eo = -1.66  V

Ag+   +   1 e-    →    Ag Eo = 0.799 V

 

2. Cu2+  +   2 e-    →   Cu Eo = 0.337

Zn2+  +   2 e-    →    Zn Eo = -0.763

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