Question

pH of solution containing equimolar amount of $C{H}_{3}COOH(p{K}_a=4.74)$ and $C{H}_{3}CO{O}^{-}$ at ${50}^{\circ }C$ is

• A. None of these
• B. More than $4.74$
• C. Less than $4.74$
• D. Equal to $4.74$

Answer 1

The correct option is D Equal to $4.74$

$pH=p{K}_a+log\frac{\left[salt\right]}{\left[acid\right]}$
$\left[salt\right]=\left[acid\right]$
$pH=p{K}_a$
$=4.74$