MCAT General Chemistry Question 298: Answer and Explanation

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Question: 298

5. What is the expected potential of the cell at the start of the experiment?

  • A. +0.118 V
  • B. +0.059 V
  • C. -0.118 V
  • D. -0.059 V

Correct Answer: B

Explanation:

B A concentration cell is spontaneous, eliminating the negative values of potential in choices C and D. The net "reaction" of the concentration cell in the passage is:

Therefore, the reaction quotient is:

Copper is reacting between the Cu and Cu(II) state, so n = 2. Substitute these quantities into the Nernst equation to solve for potential:

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