Question

3. The apparatus in Figure I is used for electrolytic deposition of 0.0500 M Cu2 ion from a solution which is buffered to pH 3.00. Oxygen is evolved at the anode at 1.00 atm. E07% = 0.000 V. (a) Given that Ecu 2+/Cu 6 to 12 V de -0.337 V,E:2/H20 7 V, E02/H,o 1.229 V and the internal resistance of the cell is 15.0 Ω. current(A Calculate the potential that must be applied to cause an Voltmeter electrolytic current of 2.00 mA. (b) State and explain the source of overvoltage in this Motor experiment. (c) Justify why Pt gauze rather than Pt paddle is chosen as the cathode. (d) If the solution also contains 0.1500 M Pb", is it feasible to quantitatively separate Cu? from Pb' by Ta, dorm Pt anode beaker electrolytic deposition? (Assume that the complete deposition of one metal ion is achieved when the concentration of the metal ion is lower than 0.0001M, and E0b2+/Pb =-0.126 V) Pt gauze cathode (e) Under the same conditions of (d), is it feasible to completely deposit all the metal ions in this solution? Figure 1

Answer 1

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