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Question

Equivalent conductances of NaCl,HCl and CH3COONa at infinite dilution are 126.45,426.16 and 91 ohm1cm2eq1 respectively. The equivalent conductance of CH3COOH at infinite dilution would be:

A
101.38 ohm1cm2eq1
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B
253.62 ohm1cm2eq1
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C
389.71 ohm1cm2eq1
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D
678.0 ohm1cm2eq1
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Solution

The correct option is D 389.71 ohm1cm2eq1

Given that,

˚NaCl=126.45 ohm1cm2eq1

˚HCl=425.16 ohm1cm2eq1

˚CH3COONa=91 ohm1cm2eq1


˚NaCl=˚Na++˚Cl=126.45(i)


˚HCl=˚H++˚Cl=425.16(ii)


˚CH3COONa=˚CH3COO+˚Na+=91(iii)


˚CH3COOH=˚CH3COO+˚H+


(iii)+(ii)(i)

425.16+91126.45

=389.71 ohm1cm2eq1


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