NaOH. What is pH? a. 25 mL NaOH

b. 100 mL NaOH (this is the hardest one... i could not figure it out.)

c. 125 mL NaOH

so this is supposed to be a quesiton on my CHEM final.. and i definitely need all the hlep i can get.
for a, i got 4.46 (which doesnt make sense)
for b, i got 8.37 (i know i did something wrong)
for c, i got 3.6 (yeah. i know.)

if you understand this problem PLEASE write the steps because i do NOT understand titrations at ALL!