試題詳解

18. What is the pH at the equivalence point when 100.0 mL of 0.1 M HC₇H₅O₂ (K_a = 6.4 × 10^-5 ) titrated by 0.10 M NaOH?
(A)4.19
(B) 10.74
(C)5.96
(D) 7.89
(E)8.45