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Q.

0.05M solution of HCOOH is 4% ionized then its dissociation constant is $2^{x} \times 10^{- 5}$ then x is ____ [Consider $1 - α ≃ 1]$

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answer is 3.

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Detailed Solution

$k_{a} = \frac{{cα}^{2}}{1 - α}$ taking $1 - α = 1, k_{a} = {cα}^{2}$ (or) $k_{a} = 8 \times 10^{- 5} ∴ x = 3$

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