question_answer 1)

Determine the degree of ionization and \[pH\] of 0.05 M of ammonia solution. The ionization constant of ammonia is\[1.77\times {{10}^{-5}}\]. Also calculate the ionization constant of conjugate acid of ammonia.

Answer:

We know, \[{{K}_{a}}\times {{K}_{b}}={{K}_{w}}\] \[{{K}_{a}}\frac{{{K}_{w}}}{{{K}_{b}}}=\frac{{{10}^{-14}}}{1.77\times {{10}^{-5}}}=5.65\times {{10}^{-10}}\] For the mono acidic base: \[\alpha =\sqrt{\frac{{{K}_{b}}}{C}}=\sqrt{\frac{1.77\times {{10}^{-5}}}{0.05}}\] = 0.0188