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The molar conductivity of a 1 M solution of a weak acid HA is 20 ohm⁻¹ cm² mol⁻¹, while its limiting molar conductivity (at infinite dilution) is 400 ohm⁻¹ cm² mol⁻¹. What is the percentage dissociation of HA?

1. 5 %
2. 10 %
3. 20 %
4. 2.5 %

Correct answer: 5 %

Solution

For a weak electrolyte, the degree of dissociation equals the ratio of the molar conductivity at the given concentration to the limiting molar conductivity at infinite dilution.

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