What is the pH of a buffer solution that is 0.211 M in lactic acid and 0.111 M in sodium lactate? The K_aof lactic acid is 1.37 × 10^-⁴. A) 4.13 B) 3.57 C) 5.48 D) 14.28 E) 10.43

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Quizplus · Accepted Answer

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). Here, pKa = -log(1.37 × 10^-4) ≈ 3.86. Plugging in the concentrations, pH = 3.86 + log(0.111/0.211) ≈ 3.57.

What Is the PH of a Buffer Solution That Is