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The degree of dissociation of an acid HA...

The degree of dissociation of an acid HA in 0.1 M solution is 0.1%. Its dissociation constant is

Text Solution

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`k_a = C alpha^2`
Since dissociation constant of acid, `K_a` is constant, `alpha ` depends upon concentration.
` alpha^2 prop (1)/(c ) or alpha prop (1)/( sqrt(C )) or (alpha_2)/(alpha_1)= sqrt((c_1)/(c_2))`
Substituting the values, `(alpha_2)/(0.006) = sqrt((0.1 )/( 0.05 ) )= sqrt(20)`
solving the values `alpha_2 = 0.006 xx sqrt(20 ) `
the dgree of dissociation in 0.05 M solution is `0.027`
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