Equilibrium Question 302
Question: The pH of a solution at $ 25{}^\circ C $ containing $ 0.10,m $ sodium acetate and $ 0.03,m $ acetic acid is $ (pK_{a} $ for $ CH_3COOH=4.57) $ [AIIMS 2002; BHU 2002]
Options:
A) 4.09
B) 5.09
C) 6.10
D) 7.09
Show Answer
Answer:
Correct Answer: B
Solution:
$ pH=pK_{a}+\log \frac{[\text{ salt }]}{acid} $
$ =4.57+\log \frac{0.10}{0.03}=5.09 $
