What is the pH of 0.050 M benzoic acid (Ka = 6.6 × 10^–5) is titrated with 0.05 M NaOH? Can you show me how to find the pH please?

Calculating the pH of a titration of a weak acid with a strong base is a several step procedure, so much so that questions about how to do it are usually ignored. Here are some solved examples of calculations concerning a weak acid being titrated with a strong base:

http://www.chemteam.info/AcidBase/Titration-problems-weak&strong.html

What volume of NaOH is used in the titration? ... Without this there is no way to find the pH.