【Daily Question】Theoretical Foundation 2020.08.30
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Multiple-choice question: (-)Zn│ZnSO4(C1)‖CuSO4(C2)│Cu(+). If hydrogen sulfide is introduced into the copper half-cell, what will be the trend in the electromotive force of the galvanic cell? A. Increase B. Decrease C. Remain unchanged D. Unable to determine. Answer: B. Hint: Extra rewards will be given to those who can explain the solution process; the answer can be found in the response
B. Hydrogen sulfide reacts with copper sulfate to produce copper sulfide precipitate, reducing the concentration of copper sulfate ions and thereby lowering the potential between the positive and negative electrodes