The pH of a solution that is 0.25 molar in acetic acid and 0.1 molar in sodium acetate is 4.36. What is the pKa of acetic acid?

Question

Quizplus · Accepted Answer

The pKa of acetic acid can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the acetate ion and [HA] is the concentration of acetic acid. Plugging in the given values: 4.36 = pKa + log(0.1/0.25). Solving for pKa gives 4.76.

The PH of a Solution That Is 0