MCAT General Chemistry Question 140: Answer and Explanation
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Question: 140
5. The function of a buffer is to:
- A. maintain a neutral pH.
- B. resist changes in pH when small amounts of acid or base are added.
- C. slow down reactions between acids and bases.
- D. speed up reactions between acids and bases.
Correct Answer: B
Explanation:
The purpose of a buffer is to resist changes in the pH of a reaction. Buffers are not generally used to affect the kinetics of a reaction, so choices (C) and (D) are incorrect. Choice (A) is correct only in specific circumstances where the pH of the buffer solution itself is neutral. Many natural buffer systems maintain pH in the acidic or basic ranges.