Consider the titration of 100.0ml of 0.200m acetic acid

Consider the titration of 100.0 ml of 0.200 M acetic acid (Ka=1.8×10−5)(Ka=1.8×10−5) with 0.100 M KOH.
Calculate the pH of the resulting solution after each of the following volumes of KOH has been added. 50.0 mL