Question

At ${25}^{\circ }C$ molar conductance of 0.1 molar aqueous solution of an ammonium hydroxide is $9.54oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ and at infinite dilution its molar conductance is $238oh{m}^{-1}c{m}^{2}mo{l}^{-1}$. The degree of ionization of ammonium hydroxide at the same concentration and temperature is ?

Answer 1

Molar conductance of $0.1M$ solution= $\lambda =9.54oh{m}^{-1}c{m}^{2}mo{l}^{-1}$

At infinite dilution, ${\lambda }^{\infty }=238oh{m}^{-1}c{m}^{2}mo{l}^{-1}$

Hence, degree of ionization= $\frac{\lambda }{{\lambda }^{\infty }}=\frac{9.54}{238}=0.04$ .