Question

The following curve is obtained when molar conductivity (Λ_m) is plotted against the square root of concentration, C^1/2 for two electrolytes A and B :

(i) How do you account for the increase in the molar conductivity of the electrolyte A on dilution ? 

(ii) As seen from the graph the value of limiting molar conductivity (Λ°m) for electrolyte B cannot be obtained graphically. How can this value be obtained ?

Answer 1

 (i) As seen from the graph, electrolyte A is a strong electrolyte which is completely ionised in solution. With dilution, the ions are far apart from each other and hence the molar conductivity increases.

(ii) To determine the value of limiting molar conductivity for electrolyte B, indirect method based upon Kohlrausch law of independent migration of ions is used.