Interpretation:
The cathode and anode in the refining setup needs to be identified.
Concept introduction:
In an electrolytic cell, the negative terminal is the cathode and the positive terminal is the anode.
Answer to Problem 72A
In the electrolytic refining of copper, the anode and cathode are determined by the electrical connections. The piece of copper to be refined is connected to the positive terminal to be made anode and the pure copper strip is connected to the negative terminal to be made cathode.
Explanation of Solution
The anode gets ionized in the electrolytic cell and ions in the solution get deposited on the cathode. Therefore the impure copper is made anode and the pure copper is made cathode.
The determination of anode and cathode depends on the purity of the copper pieces and the electric connections.
Chapter 20 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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