Question

At 0.04 M concentration the molar conductivity of a solution of a electrolyte is 5000 ${\Omega }^{-1}$ $c{m}^{-2}$ $mo{l}^{-1}$ while at 0.01M concentration the value is 5100 ${\Omega }^{-1}$ $c{m}^{-2}$ $mo{l}^{-1}$. Making necessary assumption (Taking it as strong electrolyte) find the molar conductivity at infinite dilution and also determine the degree of dissociation of strong electrolyte at 0.04 M.

Answer 1

From the graph we can see the ${\lambda }_M^{\infty }$ value of 5200 ${\Omega }^{-1}$ $c{m}^2$ $mo{l}^{-1}$.

Hence $\alpha =\frac{\lambda }{{\lambda }^{\infty }}=\frac{5000}{5200}=0.9615=0.96$

$\therefore \alpha \%=96$