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Give a note on measurement of limiting molar conductivity of solution of weak electrolyte. |
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Answer» Solution :* At infinite dilution (i.e., concentration `c to` zero) electrolyte dissociates completely `(alpha=1)`, but at such low concentration the CONDUCTIVITY of the solution is so low that it cannot be measured accurately. * Also, value of `Lamda_(m)^(@)` can.t be measured by extrapolation of graph of `Lamda_(m) to c^(1//2)`. * Therefore, `Lamda_(m)^(@)` for WEAK electrolytes is obtained by USING KOHLRAUSCH law of independent migration of ions. * `Lamda_(m)^(@)` value can be obtained on the basis of individual `lamda^(@)` value of individual ions. * Calculation of dissociation CONSTANT of electrolyte like Acetic acid can be obtained from the value of `Lamda_(m)^(@)` and obtained `Lamda_(m)` value. |
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