Effect of Dilution

Effect of Dilution are as follows:
(i) The conductivity of solution increases on dilution.
(ii) The specific conductivity decreases on dilution (as number of ions decreases w.r.t. to volume).
(iii) The equivalent and molar conductivities increase with dilution.
(iv) The equivalent and molar conductivities tend to acquire maximum value with increasing dilution. [Maximum at dilution]
(v) Variation of molar conductance with concentration: For a strong electrolyte it is shown by Debye-Huckel Sagar equation as follows:
In place of we can also use
Here, =molar conductance at infinite.
dilution (Limiting molar conductance)
= Molar conductance at V-dilution
b = It is a constant which depends upon nature of solvent and temperature
c = concentration
Effect of dilution
? increases on dilution as inter-ionic attraction also decreases along with dilution.F .W. Kohlraush (1875) determined the values of equivalent conductivity at infinite dilution for a large number of electrolytes and observed that the difference between the equivalent conductivity at infinite dilution of pairs of salts, having either a cation or anion in common, is constant at constant temperature.
For example, the difference between at 25°C for K and Na salts having a common anion is always found to be and that for chloride and bromide having a common cation is always . It is clear from the following table: