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Question
The equivalent conductance of `"M"/36` solution of a weak monobasic acid is 6 mho cm2 equivalent−1 and at infinite dilution is 400 mho cm2 equivalent−1. The dissociation constant of this acid is ____________.
Options
1.25 × 10−6
6.25 × 10−6
1.25 × 10−4
6.25 × 10−5
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Solution
The equivalent conductance of `"M"/36` solution of a weak monobasic acid is 6 mho cm2 equivalent−1 and at infinite dilution is 400 mho cm2 equivalent−1. The dissociation constant of this acid is 6.25 × 10−6.
Explanation:
α = `Λ/(Λ_∘) = 6/400`
Ka = α2C
= `6/400 xx 6/400 xx 1/36`
= 6.25 × 10−6
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