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  4. If pKa =- log K a =4 and K a = Cx 2 then van't Hoff factor weak monobasic acid when C =0.01 M is

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Q. If $pKa =-\log K _{ a }=4$ and $K _{ a }= Cx ^{2}$ then van't Hoff factor weak monobasic acid when $C =0.01 M$ is

Equilibrium

Solution:

$K _{ a }= Cx ^{2}$
$10^{-4}=10^{-2} \times x ^{2}$
$x =0.1$
$i=1+ x =1.1$