Walden's Rule
Walden's Rule
This empirical rule was suggested by P. Walden (1863–1957). According to this rule, the molar conductance of an electrolyte at infinite dilution is inversely proportional to the viscosity of the medium.i.e. λoM ∝ 1/η
or, λoM x η = Constant
Where, λoM is the molar conductance at infinite dilution and η is the coefficient of viscosity of the solvent.
Thus, Walden's rule states that the product of coefficient of viscosity of a solvent and the equivalent conductance of an electrolyte at infinite dilution is approximately constant and independent of the nature of the solvent.
Solvents | CH3OH | CH3OCH3 | CH3CN | C2H4Cl2 | CH3NO2 | C6H5NO2 | C6H5OH |
---|---|---|---|---|---|---|---|
λoM | 0.63 | 0.66 | 0.64 | 0.60 | 0.69 | 0.67 | 0.63 |