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0.2 molar solution of formic acid is 3.2% ionized. Its ionization constant is :

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9.6 x 10^-3

2.1 x 10^-4

1.25 x 10^-6

4.8 x 10^-5

answer is B.

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Detailed Solution

$K_{b} = {cα}^{2} = 0 .2 \times {(\frac{3 .2}{100})}^{2} = 2 .048 \times 10^{- 4}$

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