A buffer contains equal concentrations of a weak acid with pKa 4.75 and its conjugate base. What is its pH?
Answer and explanation
Correct answer: A. 4.75
- Step 1: In the Henderson-Hasselbalch equation, log(1) = 0, so pH = pKa.
Answer
4.75.
Why not the others: The other numbers do not follow from the equation.
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