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Standard XII

Chemistry

Kohlrausch Law

Ionic conduct...

Question

Ionic conductance of infinite dilution of Al3+ and So4^2- are 189 and 160 ohm^-1 cm^2 mol^-1 respectively. Calculate the molar conductance of Agso4^2-.

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Solution

From Kohlrausch's law of independent migration ,

Which states that in the limit of infinite dilution, Each ionic species makes a contribution to the conductivity of the solution that depends only on the nature of that particular ion, and is independent of the other ions present.

λ⁰(Al₂(SO4)₃) = Λ⁰(Al³⁺) + Λ⁰(SO4²⁻)

⇒858 = x + 160
⇒x = 858 - 160 = 698 S cm2/mol

hence , your answer is 698 S cm2 /mol

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