The rate of charge transfer is proportional to the number of ions in the solution between the plates, which itself will vary with the concentration, c, of dissolved electrolyte. The molar conductivity, Λm, is defined as:
and allows for this variation with concentration. Λm values enable comparison of conductivities (or charge carrying capabilities) of an equivalent number of moles of electrolyte both as the type and the concentration of electrolyte is vary. These measurements allow variation in ions migration motion in these systems to be studied.
Fig. 2. The dependence of molar conductivity on concentration for (a) a strong electrolyte; (b) a weak electrolyte.