MCAT Organic Chemistry Question 150: Answer and Explanation

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Question: 150

15. The hydrogens of phosphoric acid have pK_a values that:

A. allow high buffering capacity over a small pH range.
B. allow moderate buffering capacity over a large pH range.
C. allow low buffering capacity over a small pH range.
D. do not allow buffering.

Correct Answer: B

Explanation:

Phosphoric acid has three hydrogens with pK_a values spread across the pH range. This allows some degree of buffering over almost the entire standard pH range from 0 to 14.

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