- 5 Different Batteries Have Different Driving Forces Behind Why They Work Address Each Type Of Battery In The Following 1 (107.18 KiB) Viewed 21 times
5. Different batteries have different driving forces behind why they work. Address each type of battery in the following situations. a. Compare the calculated potentials of your two concentration cells from Table 12.3 before adding additional metal ions. What makes these cells have a positive electric potential in a concentration cell? Does the comparison make sense? Explain your rationale. b. What happened to the electric potential of your concentration cell after adding more metal ions to the dilute side? Is this expected? Explain what happened using Le Châtelier's principle to connect the equilibrium with the electric potential values. c. In the cells in Table 12.2 the metal ions of both the anode and cathode were the same concentration. Explain what makes these cells produce a positive electric potential. 146 Electrochemical Cells | Laboratory 12
Table 3: Concentration cells and cell potential (voltage) data Calculated potential Observed potential Concentration cell Cul Cu²+(0.0100M)|| Cu²+ (0.100M) | Cu Zn | Zn²+(0.0100M)|| 0.02955 0.02955 Add 5m 0.100M solution to the dilute side. New potential: 0.015 E=0.059/2 log (0.1/0.01)=0.02955 E-0.059/2 log(0.1/0.01) = 0.02955 0.018 Zn²+(0.100M) Zn Cell potential calculations: (Remember that when concentrations are not 1M, the Nernst equation must be used to calculate the potential of the cell)