0.2 molar solution of formic acid is ionized 3.2 %. Its ionizatio… - Vidyadip

MCQ

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

A
$1 \times {10^{ - 12}}$
✓
$2.1 \times {10^{ - 4}}$
C
$1.25 \times {10^{ - 6}}$
D
$1 \times {10^{ - 14}}$

✓

Answer

Correct option: B.

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

(b) ${K_a} = C{\alpha ^2} = 0.2 \times {\left( {\frac{{3.2}}{{100}}} \right)^2} = 2.048 \times {10^{ - 4}}$.

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