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NEET levelSingle correct optionDifficulty 1 of 3ie062

A $0.1 M$ solution of a weak monobasic acid has pH 3.0. Treating ionisation as small compared with $c$ , its $p K_{a}$ is

A $5$
B $3$
C $4$
D $7$

Answer: A

[H X^{+}] = 1 0^{- 3}

, so

K_{a} = [H X^{+}]^{2} / c = 1 0^{- 6} /0.1 = 1 0^{- 5}

and

p K_{a} = 5

.

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