QQuestionChemistry
QuestionChemistry
A buffer solution at pH 10 has a ratio of [HA]/[A-] of 10. What is the pKa of the acid?
A. 8
B. 9
C. 10
D. 11
E. 12
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Answer
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Step 1Let's solve this step by step:
Step 2: Recall the Henderson-Hasselbalch equation
pH = pK_a + \log\frac{[A^{-}]}{[HA]}
The Henderson-Hasselbalch equation relates pH, pKa, and the ratio of conjugate acid and base concentrations:
Final Answer
The pKa of the acid is 11.
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