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A weak monobasic acid dissociates to $0.001 \%$ in its $0.01 \mathrm{M}$ solution. What is its dissociation constant?
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$1 \times 10^{-12}$
$\begin{aligned} & \mathrm{K}_{\mathrm{a}}=\propto^2 \mathrm{C} \\ & =\left(\frac{0.001}{100}\right)^2 \times 0.01 \\ & =1 \times 10^{-12}\end{aligned}$
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