Concept explainers
How much copper metal can be produced by
Interpretation:
The number of moles of copper metal deposited during the electrolysis of copper ion solution is to be determined.
Concept introduction:
The relation between the current, time taken and the charge is as follows:
Here,
is second, the S. I. unit of time, and C is coulomb, the S. I. unit of charge.
The relationship between the number of moles of electrons and the number of moles of metal is as follows:
Answer to Problem 1KSP
Solution: Option (b).
Explanation of Solution
The reduction half-reaction for copper metal is as follows:
Therefore, two moles of electrons are needed to reduce one mole of copper metal.
The number of moles of copper metal deposited after electrolysis when 1.85 A of current is passed for four hours, is determined as follows:
The number of moles of electrons required to reduce copper metal is calculated as follows:
Now, the number of moles of copper metal reduced is calculated as follows:
Hence, option (b) is correct.
Reason for incorrect options:
Option (a) is incorrect because on solving with the help of the above equation, the answers do not match with option (a).
Option (c) is incorrect because on solving with the help of the above equation, the answers do not match with option (c).
Option (d) is incorrect because on solving with the help of the above equation, the answers do not match with option (d).
Option (e) is incorrect because on solving with the help of the above equation, the answers do not match with option (e).
Hence, options (a), (c), (d), and (e) are incorrect.
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Chapter 19 Solutions
Chemistry
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