試題詳解

68. A diprotic acid H₂A has K_a1 = 1 x 10^–4 and K_a2 = 1 x 10^–8 . The corresponding base A^2– is titrated with aqueous HCl, both solutions being 0.1 mol/L. Which one of the following diagrams best represents the titration curve which will be seen?
(A)
(B)
(C)
(D)
(E)