Question

The $pH$ of a solution which is 0.1 M sodium acetate and 0.01 M acetic acid $(p{K}_a=4.74)$ would be:

• A. $5.74$
• B. $4.74$
• C. $4.1$
• D. None of these

Answer 1

The correct option is A $5.74$

Given a solution which is $0.1M$ sodium acetate and $0.01M$ acetic acid. This is an acidic buffer solution.

$pH=p{K}_a+log\frac{\left[C{H}_{3}COONa\right]}{\left[C{H}_{3}COOH\right]}=4.74+log\frac{0.1}{0.01}=4.74+1=5.74$

Hence, the pH of the buffer solution is $5.74$.