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A 0.2 M solution of formic acid is 3.2% ionized. Its ionization constant is

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$9.6 \times 10^{- 3}$

$2.1 \times 10^{- 4}$

$1.25 \times 10^{- 6}$

$4.8 \times 10^{- 5}$

answer is B.

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Detailed Solution

C = 0.2 M

$α = 3.2 % = \frac{3.2}{100}$

$K_{a} = {Cα}^{2}$

$= 0.2 \times \frac{3.2}{100} \times \frac{3.2}{100}$

$= 2.1 \times 10^{- 4}$

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