Using the Henderson-Hasselbalch equation, calculate the pH of a buffer solution made from 0.20 M CH₃COOH and 0.050 M CH₃COO^- that has pK_a= 4.7. A) 5.3 B) 4.1 C) 2.5 D) 0.4 E) None of the answers is correct.

Question

Quizplus · Accepted Answer

The Henderson-Hasselbalch equation is pH = pKa + log([A-]/[HA]). Substituting the given values: pH = 4.7 + log(0.050/0.20) = 4.7 + log(0.25) = 4.7 - 0.6 = 4.1.

Using the Henderson-Hasselbalch Equation, Calculate the PH of a Buffer