Question

Calculate the H+ concentration (M) of a 0.010 M solution of NH4Cl. Note that the Kb for NH3 is 1.8 e-5.

Answer 1

The NH4^+ hydrolyzes in water solution.

NH4^+ + H2O ==> NH3 + H3O^+

Ka = (Kw/Kb) = (NH3)(H3O^+)/(NH4^+)
Set up an ICE chart and solve for H3O^+..