MCAT General Chemistry Question 144: Answer and Explanation
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Question: 144
9. Question below refer to the titration curve of acid X shown below:
What is the approximate value of pKa2?
- A. 3.6
- B. 4.1
- C. 5.5
- D. 7.2
Correct Answer: B
Explanation:
The value of the second pKa is found at the midpoint between the first and second equivalence points. In this curve, that corresponds to pH = 4.1. Just like the first pKa, it is in the center of a flat buffering region.