What is the pH of a buffer solution that is 0.251 mol L^-1 in lactic acid and 0.151 mol L^-1 in sodium lactate? The $K _ { a }$ of lactic acid is 1.4 × $10 ^ { - 4 }$ . A)12.58 B)5.28 C)4.08 D)10.37 E)3.63

Question

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(1.4 × 10^-4) ≈ 3.85. Plugging in the concentrations: pH = 3.85 + log(0.151/0.251) ≈ 3.63.

What Is the PH of a Buffer Solution That Is KaK _ { a }Ka​

What Is the PH of a Buffer Solution That Is $K _ { a }$