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Solved: Industrially, copper is purified by electrolysis.

Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro ISBN: 9780321809247 1

Solution for problem 18.97 Chapter 18

Chemistry: A Molecular Approach | 3rd Edition

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Chemistry: A Molecular Approach | 3rd Edition | ISBN: 9780321809247 | Authors: Nivaldo J. Tro

Chemistry: A Molecular Approach | 3rd Edition

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Problem 18.97

Industrially, copper is purified by electrolysis. The impure copper acts as the anode, and the cathode is made of pure copper. The electrodes are immersed in a CuSO4 solution. During electrolysis, copper at the anode enters the solution as Cu21 while Cu21 ions are reduced at the cathode. (a) Write half-cell reactions and the overall reaction for the electrolytic process. (b) Suppose the anode was contaminated with Zn and Ag. Explain what happens to these impurities during electrolysis. (c) How many hours will it take to obtain 1.00 kg of Cu at a current of 18.9 A?

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Note Set #7 – week 9 Analytical Chemistry POTENTIOMETRIC PRECIPITATION TITRATIONS  Essentially, a precipitation rxn is used to monitor/control a redox reaction in an aqueous cell.  By using what we know about precipitation and solubility, we can calculate electric potentials at various point during the precipitation titration o If for example we are titrating sodium iodide with copper nitrate, and trying to determine the voltage of the half-cell, we must look at two distinct rxns. The precipitation/titration rxn is b/w the dissolved Cu ion as it is added and the I ion. - + - 12 Cu + I CuI (s) K f 10 =========== titration reaction The redox rxn occurring at the electrode is separate: Cu + e  Cu (s) E° = 0.518 vs NHE ====== redox reaction + The small concentration of Cu ion that remains in solution is what is being reduced and being deposited on the copper electrode.  Calculating E before the equivalence point of the precipitation titration o K ofsphe rxn is 10 ; K = [Cu spI ], find the conc. of I in solution before the equivalence pt. I is in excess b/c virtually all Cu is consumed to Cu (s) - - 1. [I ] = (initial conc. of I )(equivalence volume / total volume)(the fraction of Veof titrant that has been added)

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Chapter 18, Problem 18.97 is Solved
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Textbook: Chemistry: A Molecular Approach
Edition: 3
Author: Nivaldo J. Tro
ISBN: 9780321809247

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Solved: Industrially, copper is purified by electrolysis.