Question

1. It is not possible to determine the molar conductivity of weak electrolytes at infinite dilution graphically. Do you agree with this? Justify your answer.

2. Calculate the molar conductivity of NH₄OH at infinite dilution if molar conductivity at infinite dilution of Ba(OH)₂, BaCl₂ , and NH₄Cl are 523.4, 280 and 130 ohm^-1cm²mol^-1 respectively.

Answer 1

1. Yes. I agree with this statement because for weak electrolytes such as acetic acid, molar conductivity increases rapidly with dilution.

Hence, the plot of Λ_m against \(\sqrt C\)

(C = concentration of electrolyte) is not linear. Therefore the value of Λ°_m for weak electrolytes cannot be obtained by extraploting the graph.