Consider the titration of a 20.0-mL sample of 0.105 M HC₂H₃O₂ with 0.125 M NaOH. Determine each quantity.

a. The initial pH

b. The volume of added base required to reach the equivalence point

c. The pH at 5.0 mL of added base

d. The pH at one-half of the equivalence point

e. The pH at the equivalence point

f. The pH after adding 5.0 mL of base beyond the equivalence point