Question

Obtain a relation between degree of dissociation and molar mass for an electrolyte.

Answer 1

Consider an electrolyte A_xB_y.

If i is van't Hoff factor and n is total number of ions produced from dissociation of one mole of electrolyte then, the degree of dissociation α is given by,

α = \(\frac{i-1}{n-1}\)

Now if M_th and M_ob are theoretical arid observed molecular (or molar) masses respectively, then,

i = \(\frac{M_{th}}{M_{ob}}\)

∵ α(n – 1) = i – 1

This is a relation between degree of dissociation and molecular masses of the dissolved electrolyte A_xB_y.