First slide

Ionization constants of weak acids, PH of weak acids

Question

A 0.2 molar solution of formic acid is 3.2% ionised. Its ionisation constant is

Moderate

A

$9.6 \times 10^{- 3}$
B

$2.048 \times 10^{- 4}$
C

$1.25 \times 10^{- 6}$
D

$4.8 \times 10^{- 5}$

Solution

$K = {Cα}^{2} = 0.2 \times (0.032)^{2} = 2.048 \times 10^{- 4}$

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