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Question

What will be the molar conductivity of Al3+ ions at infinite dilution if molar conductivity of Al2(SO4)3 is 858 S.cm2 mol1 and ionic conductance of SO24 is 160 S.cm2 mol1 at infinite dilution?

A
189 S.cm2 mol1
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B
698 S.cm2 mol1
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C
1018 S.cm2 mol1
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D
429 S.cm2 mol1
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Solution

The correct option is A 189 S.cm2 mol1
Since it is infinite dilution we can write,

Λ0Al2SO$=2Λ0Al3++3Λ0SO34

Λ0Al3+=Λ0Al2(SO4)33Λ0SO242

Λ0Al3+=858(3×160)2=189 S.cm2mol1

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