MCAT General Chemistry Question 163: Answer and Explanation
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Question: 163
13. Potentiometry in an oxidation–reduction titration is analogous to performing an acid–base titration with a(n):
- A. acidic indicator.
- B. basic indicator.
- C. pH meter.
- D. oxidizing agent.
Correct Answer: C
Explanation:
Potentiometry refers to carrying out an oxidation-reduction titration with a voltmeter present to get precise readings of the reaction's electromotive force (emf) to determine the endpoint. This is analogous to using a pH meter in an acid-base titration because it uses technology to get precise readings for plotting a titration curve. Indicators, as in choices (A) and (B), can be used in both acid-base and redox titrations, but provide a qualitative (rather than quantitative) analysis of the titration. Oxidizing and reducing agents are used in redox titrations, not acid-base titrations, eliminating choice (D).