Calculate dissociation constant of 0.001 M weak monoacidic base undergoing 2% dissociation.

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Question: Answered & Verified by Expert

Calculate dissociation constant of $0.001 \mathrm{M}$ weak monoacidic base undergoing $2 \%$ dissociation.

ChemistryElectrochemistryMHT CETMHT CET 2023 (14 May Shift 1)

Options:

A $4 \times 10^{-7}$
B $2 \times 10^{-6}$
C $2 \times 10^{-7}$
D $1 \times 10^{-7}$

Solution:

2544 Upvotes Verified Answer

The correct answer is: $4 \times 10^{-7}$

$\begin{aligned} & \alpha=\frac{\text { Percent dissociation }}{100}=\frac{2}{100}=0.02 \\ & K_a=\alpha^2 c=(0.02)^2 \times 0.001=4 \times 10^{-7}\end{aligned}$

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