Calculate how many mL of 0.100 M NaOH are needed to neutralize completely 32.0 mL of 0.0200 M HCl. Calculate the pH during the titration of 100.0 mL of 0.200 M HCl with 0.400 M NaOH. First what is the initial pH What is the pH after 38.5 mL of NaOH are added?