For a weak acid HA, the percentage of dissociation is nearly 1% at equilibrium. If the concentration of acid is 0.1 mol , then the correct option for its at the same temperature is [2023]

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Solution

Q.
For a weak acid HA, the percentage of dissociation is nearly 1% at equilibrium. If the concentration of acid is 0.1 mol $L^{- 1}$ , then the correct option for its $K_{a}$ at the same temperature is [2023]

1 $1 \times 10^{- 4}$

2 $1 \times 10^{- 6}$

3 $1 \times 10^{- 5}$

4 $1 \times 10^{- 3}$

Ans.
(3)

$K_{a} = C α^{2}$

$K_{a} = (0.1) \times {(0.01)}^{2} = 1 \times 10^{- 5}$

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