1B-S10-Quiz-8

1B-S10-Quiz-8 - worst oxidizing agent? Ag, Ag + , Al, Al 3+...

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Quiz 8 Name: Chem 1B, Spring 10 Fossum G° = - nFE° 1 V = 1 J/C 1 F = 96485 C/mole e - Standard Reduction Potentials at 25°C Half reaction E°, V Ag + (aq) + e - Ag (s) 0.799 Fe 2+ (aq) + 2 e - Fe (s) - 0.440 Pb 2+ (aq) + 2 e - Pb (s) - 0.126 Al 3+ (aq) + 3 e - Al (s) - 1.66 2 H + (aq) + 2 e - H 2 (g) 0 Mg 2+ (aq) + 2 e - Mg (s) - 2.37 Cl 2 (g) + 2 e - 2 Cl - (aq) 1.359 Br 2 (l) + 2 e - 2 Br - (aq) 1.065 Cu 2+ (aq) + 2 e - Cu (s) 0.337 H 2 O 2 (aq) + 2 H + (aq) + 2 e - 2 H 2 O (l) 1.776 O 2 (g) + 4 H + (aq) + 4 e - 2 H 2 O (l) 1.23 2 H 2 O (l) + 2 e - H 2 (g) + 2 OH - (aq) - 0.83 1. (6) a. Predict the half reactions that would occur at the anode and at the cathode in the electrolysis of an aqueous solution of MgBr 2 using copper electrodes. Show all possible half reactions and explain your reasoning for your choices. b. What would you expect to see happening at the anode and at the cathode? 2. (4) a. Which is the best oxidizing agent in the following list of substances? Which is the
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Unformatted text preview: worst oxidizing agent? Ag, Ag + , Al, Al 3+ , Fe, Fe 2+ , Cl 2 , Cl-, H + , H 2 . Explain your reasoning thoroughly. E = E o 0.0257 V n ln Q b. Which is the best reducing agent in the above list of substances? Which is the worst? Explain thoroughly. 3. (3) A concentration cell is assembled with 0.200 M Pb 2+ (aq) and a lead electrode in one compartment. The other compartment contains 0.000500 M Pb 2+ (aq) and a lead electrode. Determine the voltage of this electrochemical cell. 4. (7) a. A galvanic cell is assembled using Al 3+ /Al and Cu 2+ /Cu half-cells. If the concentration of Al 3+ is 0.040 M when the overall cell voltage is 1.885 V, what is the concentration of Cu 2+ ? b. If the concentration of aluminum ion is decreased, will the cell voltage increase or decrease? Explain why....
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1B-S10-Quiz-8 - worst oxidizing agent? Ag, Ag + , Al, Al 3+...

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