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Ostwald Dilution Law

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Question

Calculate the degree of ionisation of $01. M$ acetic acid. the dissociation constant of acetic acid is $1.8 \times 10^{- 5}$ .

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Solution

$C H_{3} C O O H ⇌ H^{+} + C H_{3} C O O^{-}$

$K = \frac{[H^{+}] [C H_{3} C O O^{-}]}{[C H_{3} C O O H]}$

$K = \frac{C α \times C α}{C (1 - α)} ≃ C α^{2} = 0.1 \times (α)^{2} = 1.8 \times 10^{- 5}$

$α = 1.34 \times 10^{- 2}$

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