Question

Consider the titration of a 25.0-mL sample of 0.110 M HC2H3O2 with 0.130 M NaOH. (The value of Ka for HC2H3O2 is 1.8×10−5.)

Found:

initial Ph =2.85

Determine the volume of added base required to reach the equivalence point. = 21.2 ml

Find

part A

Determine the pH at 4.0 mL of added base.

Part B

Determine the pH at one-half of the equivalence point.

Part C

Determine the pH at the equivalence point.