7.51  The degree of ionization of a 0.1 M bromoacetic acid solution is 0.132. Calculate the pH of the solution and the pKa of bromacetic acid.

Degree of ionization, a=0.132
Concentration, c=0.1 M
Thus, the concentration of H3O+=c.a
=0.1×0.132=0.0132pH=-logH+=-log0.0132=-1.879:1.88
Now, 
Ka=Ca2=0.1×0.1322Ka=0.0017pKa=2.75