Sodium hydroxide reacts with acetic acid to produce sodium acetate, NaC2H3O2, and water. It takes 25.0 ml of 0.40 M NaOH to completely neutralize 50.0 ml of 0.20 M HC2H3O2 solution (i.e. to reach the equivalence point). What is the pH at the equivalence point (Ka (HC2H3O2) = 1.80 x 10-5 )