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  4. The dissociation constant of a weak monoprotic acid, which is 0.01 % ionised in 1.00M solution, is

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Q. The dissociation constant of a weak monoprotic acid, which is $0.01\%$ ionised in $1.00M$ solution, is

NTA AbhyasNTA Abhyas 2022

Solution:

$K =\frac{\alpha^2 C }{1-\alpha} ; 1-\alpha \approx 1$
$\therefore K =\alpha^2 C =\left[\frac{0.01}{100}\right]^2 \times 1$
$=1 \times 10^{-8}$