Plot of fraction protonated (% HA) vs pH for a weak acid HA.
At what pH is HA exactly 50% protonated?
- Acheck_circle
pH = pKa
- B
pH = 14 - pKa
- C
pH = 7
- D
pH = pKa - 1
Explanation
From Henderson-Hasselbalch, when [HA] = [A-] (50% each), log(1) = 0, so pH = pKa.