The pK_a of lactic acid is 3.86. What is the pH of a buffer in which the lactic acid concentration is 2.0 M and the sodium lactate concentration is 0.50 M? A) 2.86 B) 3.26 C) 4.46 D) 4.86

Question

Quizplus · Accepted Answer

The pH of the buffer can be calculated using the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base (sodium lactate in this case) and [HA] is the concentration of the acid (lactic acid). Substituting the given values: pH = 3.86 + log(0.50/2.0) = 3.86 - 0.60 = 3.26.

The PKa of Lactic Acid Is 3

The PK_a of Lactic Acid Is 3