Question

Physical Chemistry Question:

Discuss the reason for plotting ʌeq, the equivalent conductivity, versus ,c^1/2, the squared root of concentration.

Answer 1

A plot of equivalent conductance versus sq.rt. of concentration is valid for all electrolytes. The plot is more commony known as kohlrausch plot. It is a method of determinatiom of equivalent conductance at infinite dilution. In order to obtain a relationship between conductance and concentration the sq.rt of conc. plot gave a linear relationship plot. It was found that for all the electrolytes the equivalent conductance reduced with increasing concentration. This effect was attribted to the clustering of counterions and delay in dissociation at higher concentrations of electrolyte salts added. For weak electrolytes the linear relationship was found at very dilute concentration of salts.