Why cannot we determine the molar conductivity a weak electroylte at infinite dillution ?

Explanation

We can determine the molar conductivity of an electrolytic solution at infinite dilution `(Delta_(m)^(@))` , if the plot of molar conductivity vs concentration (obtained from experiments ) is extrapolated to zero concentration is extrapolated to zero concentration. As `Delta_(m)` of the solution of a strong electrolyte varies linearly with the concentrations of the solution , the method of extrapolation is used to determine `Delta_(m)^(@)` for strong electrolytes . However , this method cannot be use for the solution of a weak eletrolyte because `Delta_(m)` for such a solution keeps on increasing with dilution even at very low extrapolation becomes invalid . Hence , molar conductivity of a weak electrolyte at infinite dilution cannt be determined experimentally .