Calculate the pH of a solution prepared by dissolving 0.150 mol of benzoic acid (HBz) and
0) 300 mol of sodium benzoate in water sufficient to yield 1.00 L of solution. The K_aof benzoic acid is 6.50 × 10^-⁵.

Question

Quizplus · Accepted Answer

The solution is a buffer, and the pH can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). Here, pKa = -log(6.50 × 10^-5) = 4.19. The ratio [A-]/[HA] = 0.300/0.150 = 2. Therefore, pH = 4.19 + log(2) ≈ 4.49.

Calculate the PH of a Solution Prepared by Dissolving 0