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

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

ChemistryIonic EquilibriumJEE Main

Options:

A $9.6 \times 10^{-3}$
B $2.1 \times 10^{-4}$
C $1.25 \times 10^{-6}$
D $4.8 \times 10^{-5}$

Solution:

1518 Upvotes Verified Answer

The correct answer is: $2.1 \times 10^{-4}$

$K_a=C \alpha^2=0.2 \times\left(\frac{32}{100}\right)^2=2.048 \times 10^{-4}$

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