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Write Kohlrausch law and give its importance (applications). |
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Answer» Solution :* Law: The law states that limiting molar conductivity of an electrolyte can be represented as the SUM of the individual contributions of the anion and cation of the electrolyte. * USES :Using Kohlrausch law of independent MIGRATION of ions, it is possible to calculate `Lamda_(m)^(@)` for any electrolyte from the `lamda_(m)^(@)` of individual ions. `Lamda_(m)^(@)=(v_(+)lamda_(m^(+))^(@)+v_(-)lamda_(m^(-))^(@))` * Moreover, for weak electrolytes like acetic acid it is possible to determine the value of its dissociation constant once we know the `Lamda_(m)^(@) and Lamda_(m)` at a given CONCENTRATION c. * `kappa_(a)=(calpha^(2))/(1-ALPHA)=(cLamda_(m)^(2))/(Lamda_(m)^(@)(Lamda_(m)^(@)-Lamda_(m)))` * Degree of dissociation of weak electrolyte: `(alpha)=(Lamda_(m))/(Lamda_(m)^(@))`. |
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