Q. The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is [Given $pK_a$ of $CH_3COOH$ = 4.57]
A) 2.57
B) 5.57
C) 3.57
D) 4.57
Explanation
[Solution] Buffer: $pH = pK_a + \log\frac{[salt]}{[acid]} = 4.57 + \log\frac{0.10}{0.01} = 5.57$. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.