An organic weak monobasic acid is 0.001 percent dissociated in its $0.05 \mathrm{M}$ solution. What is its…

An organic weak monobasic acid is 0.001 percent dissociated in its $0.05 \mathrm{M}$ solution. What is its dissociation constant?
  1. $6 \times 10^{-12}$
  2. $5 \times 10^{-12}$
  3. $4 \times 10^{-12}$
  4. $1 \times 10^{-12}$

Solution

$\begin{aligned} & \mathrm{Ka}=\alpha^2 \mathrm{C} \\ & =\left(\frac{0.001}{100}\right)^2 \times 0.05 \\ & =5 \times 10^{-12}\end{aligned}$

Asked in: MHT CET 2022 (06 Aug Shift 1)

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