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Explain Kohlrausch law of independent migration of ions. |
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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. * For example, if limiting molar conductivity of positive and negative ions is `lamda_(m^(+))^(@) and lamda_(m^(-))^(@)`, respectively then limiting molar conductivity of solution `(lamda_(m)^(@))` will be as FOLLOWS: `Lamda_(m)^(@)=v_(+)lamda_(m^(+))^(@)+v_(-)lamda_(m^(-))^(@)` * Explanation: If `K^(+)` of `lamda_(m^(+))^(@)=73.5` and `lamda_(m^(-))^(@)` of `Br^(-)=78.1" S "cm^(2)mol^(-1)` then limiting molar conductivity of KBr solution at infinite dilution is as follows. `Lamda_(m)^(@)(KBr)=lamda_(m)^(@)(K^(+))+lamda_(m)^(@)(Br^(-))` `=73.5+78.1` `=151.6" S "cm^(2)mol^(-1)` 
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