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Experiment 9 AUP - Experiment 9 Results and...

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Experiment 9 Results and Questions (Discussion) A. Reduction Potentials of Several Redox Couples Galvanic Cell Measured E cell (V) Anode Equation for Anode Reaction Cathode Equation for Cathode Reaction Cu-Zn 0.891 Zn Zn → Zn 2+ + 2e Cu Cu 2+ + 2e → Cu Cu-Mg 1.704 Mg Mg → Mg 2+ + 2e Cu Cu 2+ + 2e → Cu Cu-Fe 0.645 Fe Fe → Fe 2+ + 2e Cu Cu 2+ + 2e → Cu Zn-Mg 0.766 Mg Mg → Mg 2+ + 2e Zn Zn 2+ + 2e → Zn Fe-Mg 1.040 Mg Mg → Mg 2+ + 2e Fe Fe 2+ + 2e → Fe Zn-Fe 0.291 Zn Zn → Zn 2+ + 2e Fe Fe 2+ + 2e → Fe 1. Write the balanced net reaction for each of the galvanic cells. Example: Cu-Zn Zn (s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu (s) 2. 0.766V Based on Zn-Mg = 0.766 V, Mg-Cu = 1.704 V Zu-Cu cell potential = 1.704 – 0.766 V = 0.938 V Zn-Cu cell potential ( experiment) = 0.891 V Value nearly the same. 3. Mg Zn Fe Sum of Zn-Fe and Zn-Mg cell potentials = 0.291 + 0.766 V = 1.057 V Fe-Mg cell potential (experiment) 1.040 V Value nearly the same. 4. Redox Couple Reduction Potential (Measured) (V) Reduction Potential (Calculated) (V) % Error Cu 2+ / Cu 0.101 0.310 Fe 2+ / Fe -0.499 -0.440 Zn 2+ /Zn -0.790 -0.76 Mg 2+ /Mg -1.556 -0.2410 Mg Zn Cu 1.704 V 0.291 V 0.766 V
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