Engineering Board Exam Reviewer · Chemistry · hard
A buffer contains 0.1 M acetic acid and 0.2 M sodium acetate. What is its pH? (pKa = 4.74)
- 4.74
- 4.44
- 5.04
- 6.74
Answer
C. 5.04
Solution
Henderson–Hasselbalch: pH = pKa + ([A-]/[HA]) = 4.74 + 2 = 5.04.
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