First slide

Ionization constants of weak acids, PH of weak acids

Question

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

Moderate

A

9.6 x 10^-3
B

2.1 x 10^-4
C

1.25 x 10^-6
D

4.8 x 10^-5

Solution

We know,
$a = \sqrt{\frac{K_{a}}{C_{0}}} \Rightarrow K_{a} = C_{0} \times α^{2} = 0.2 \times (0.032 \times 0.032) \Rightarrow K_{a} = 2 \times 10^{- 4}$

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