What is the pH of a buffer solution containing acetic acid (, ) and sodium acetate ()?
Answer and explanation
Correct answer: A.
- Step 1: Apply Henderson-Hasselbalch equation: .
- Step 2: Substitute concentrations: and .
- Step 3: Evaluate log ratio: .
- Step 4: Calculate .
Answer
4.74.
Why not the others: '' would occur if base-to-acid ratio were ; '' would occur if acid were twice the base; '' is neutral water pH.
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