1. The problem statement, all variables and given/known data Based on the following chart, what ions would you use to construct an electrochemical cell with potential closest to 2.00 V? [PLAIN]http://img546.imageshack.us/img546/5568/electrochemicalcellchar.png [Broken] 2. Relevant equations I know that I am supposed to add the voltages of the 2 reactions but I am not sure how the signs would go. We are not using a textbook for this class so I have nothing to reference. 3. The attempt at a solution I'd use the following reactions and voltages Fe3+ -> Fe2+ (-0.771 gaining electron) Na (s) -> Na+ (+2.71 losing electron) so the cell voltage would be 1.94V. Is this correct?