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Ostwald Dilution Law

At 15 o C,0...

Question

At $15^{o} C, 0.05 N$ solution of a weak monobasic acid is $3.5$ % ionised. Calculate the ionisation constant of acid.

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Solution

$H A ⇌ H + A^{-}$
$K = \frac{[H^{+}] [A^{-}]}{[H A]}$
$K = \frac{C α \times C α}{C (1 - α)} ≃ C α^{2} = 0.05 \times (0.035)^{2} = 6.125 \times 10^{- 5}$

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