A buffer solution contains acetic acid (, , ) and sodium acetate (). What is the pH of this buffer system?
Answer and explanation
Correct answer: C.
- Step 1: Apply the Henderson-Hasselbalch equation: .
- Step 2: Identify conjugate base and acid concentrations: and .
- Step 3: Evaluate ratio and logarithm: , and .
- Step 4: Conclude pH: .
Answer
.
Why not the others: '' corresponds to a 10-fold excess of acid; '' corresponds to a 10-fold excess of conjugate base; '' assumes complete neutralization to water neutrality.
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