Determine the ph during the titration of 293 ml of 0278 m

Question

Determine the pH during the titration of 29.3 mL of 0.278 M hydroiodic acid by 0.274 M sodium hydroxide at the following points:

(1) Before the addition of any sodium hydroxide _______

(2) After the addition of 14.9 mL of sodium hydroxide _______

(3) At the equivalence point _________

(4) After adding 36.2 mL of sodium hydroxide _________