Question

If $pKa=-\log K_a=4$ and $K_a=C{x}^2$ then van't Hoff factor weak monobasic acid when $C=0.01M$ is

• A. 1.02
• B. 1.01
• C. 1.20
• D. 1.10

Answer 1

Answer: (D)

$K_a=C{x}^2$
$10^{-4}=10^{-2}\times x^2$
$x=0.1$
$i=1+x=1.1$