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Question
Answer the following in brief :
Acetic acid is 5% ionised in its decimolar solution. Calculate the dissociation constant of acid.
Solution
Given: Percent dissociation = 5%, Concentration (c) = 1 decimolar
To find: Dissociation constant of acid (Ka)
Formulae:
i. Percent dissociation = α × 100
ii. Ka = α2 c
Calculation:
Using formula (i),
α = `"Percent dissociation"/100 = 5/100 = 0.05`
c = 1 decimolar = 0.1 M
Using formula (ii),
Ka = (0.05)2 × (0.1)
= 2.5 × 10-4
The dissociation constant of acid is 2.5 × 10-4.
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