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Standard XII

Chemistry

Kohlrausch Law

at infine dil...

Question

at infine dilution the molar conductivity of Na+ and So4(2-) ion are 50 siemen centimeter square mol-1 and 160 siemen centimeter square mol-1 respect what will be the molar cunductivities of sodium sulphate at infinite dilution

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Solution

Dear Student ,
We know by Kohlrausch's law for strong electrolytes at infinite dilution ,

Λ_m⁰ = λ₊⁰ + λ_-⁰

Similarly, for Na₂SO₄we can write, Λ_m⁰(Na₂SO₄ ) = 2λ_Na+⁰ + λ_SO4--⁰

This implies, Λ_m⁰(Na₂SO₄ ) = (250) + 160 = 260 S Cm² mol^-1

Hence the required molar conductivity of sodium sulphate at infinite dilution is 260 S Cm²mol^-1

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