Calculate the pH during the titration of 40.00 mL of 0.1000 M HCl with 0.1000 M NaOH

Calculate the pH during the titration of 40.00 mL of 0.1000 M HCl with 0.1000 M NaOH solution after the following additions of base:
a) 0 mL
b) 25.00 mL
c) 39.00 mL
d) 39.90 mL
e) 40.00 mL
f) 40.10 mL
g) 50.00 mL