Which of the following curve gives the variation of \(\Lambda _m^∞\) with \(\sqrt{c}\) for \(CH_3COOH\).

The correct answer is option 4.

We know that molar conductivity of a solution comprises one mole of the electrolyte and it is not fixed. It is the conductance unit mole of electrolyte that is kept between two electrodes of unit cross section or at a distance of one-centimeter.

We must remember that the molar conductivity of a strong electrolyte like strong bases and strong acids at infinite dilution could be determined by extrapolation as a straight line plot is obtained. In the case of weak electrolyte, we cannot measure the molar conductivity at infinite solution experimentally and also by extrapolation because the plot determined is not straight line, the highest value of molar conductivity at infinite solution cannot be obtained.

The dissociation of weak electrolyte keeps increasing with respect to dilution. When the solution is more dilute the value of molar conductivity of greater and ionic dissociation also increases.

An example of weak electrolyte is acetic acid. The molar conductivity of acetic acid is high in dilute solutions of acetic acid when compared to concentrated solutions of acetic acid.

A graph containing \(\Lambda _m^∞\) vs \(\sqrt{c}\) for acetic acid (weak electrolyte) solution is drawn below,