Question

$p{K}_a$ of $C{H}_{3}COOH$ is 4.74. The pH of 0.01 M $C{H}_{3}COONa$ is

• A. 4.74
• B. 8.37
• C. 9.48
• D. None of these

Answer 1

Answer: (B)

$C{H}_{3}COONa$ is a salt of a weak acid and strong base
$\therefore PH=7+\frac{1}{2}[P{K}_a+logC]$
$=7+\frac{1}{2}[4.74+log0.01]$
$=7+\frac{1}{2}[4.74-2]$
$=8.37$