Q.

Based on Henderson-Hasselbalch equation, at what pH value a weak acid would be 99.9% ionized?

A. At pH equivalent to pKa - 3
B. At pH equivalent to pKa + 3
C. At pH equivalent to pKa – 1
D. At pH equivalent to pKa + 1
Answer» B. At pH equivalent to pKa + 3
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