Question

At 25oC molar conductance of 0.1 molar aqueous solution of ammonium hydroxide is 9.54ohm−1cm2mol−1 and at infinite dilution its molar conductance is 238ohm−1cm2mol−1. The degree of ionisation of ammonium hydroxide at the same concentration and temperature is -

Answer 1

Degree of (\alpha )=\frac{molar \: conductivity\: at \: conc.c(\wedge ^{c}_{m})}{molar \: conductivity \:at \:infinite\: dilution(\wedge ^{\infty }_{m}) }

(\alpha )=\frac{9.54\Omega ^{-1}cm^{2}mol^{-1}}{238\Omega ^{-1}cm^{2}mol^{-1}}

=0.04008

=4.008%