The dissociation constant of a weak monobasic acid is $3.2 \times 10^{-4}$. Calculate the degree of…

The dissociation constant of a weak monobasic acid is $3.2 \times 10^{-4}$. Calculate the degree of dissociation in its 0.04 M solution.
  1. 0.0128
  2. 0.0151
  3. 0.078
  4. 0.089

Solution

$\mathrm{K}_{\mathrm{a}}=3.2 \times 10^{-4} ; \mathrm{c}=0.04 \mathrm{M}$
For a monobasic acid, $\alpha=\sqrt{\frac{K_a}{c}}=\sqrt{\frac{3.2 \times 10^{-4}}{0.04}}=\sqrt{8 \times 10^{-3}}=0.089$

Asked in: MHT CET 2024 (15 May Shift 1)

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