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Q. What is the percentage dissociation of $0.1\, M$ solution of acetic acid? $(K_a = 10^{-5})$

Equilibrium

Solution:

$\alpha=\sqrt{\frac{K_{a}}{c}}$ or $\alpha=\sqrt{\frac{10^{-5}}{0.1}}=10^{-2}$
$\%$ dissociation $=10^{-2}\times100=1\%$