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Q.

A weak monobasic acid is 1% ionized in 0.1 M solution at 25°C. The percentage of ionization in its 0.025 M solution is

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a

2

b

1

c

3

d

4

answer is B.

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Detailed Solution

$\begin{array}{l} HA ⇌ H^{+} + A^{-} \\ K = {Cα}^{2} = 0 .1 \times {(\frac{1}{100})}^{2}, K = 10^{- 5} \\ K = {Cα}^{2} or 10^{- 5} = 0 .025 \times α^{2} \\ α = \sqrt{\frac{10^{- 5}}{0 .025}} \Rightarrow α = 0 .02 \end{array}$
% age of ionization = 2.

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