試題詳解

(1) At the equivalence point, the pH is calculated using the acid dissociation reaction of the conjugate acid, BH⁺.

(2) Past the equivalence point, the excess strong acid determines the pH.

(3) Before strong acid is added, the solution contains just the conjugate acid, BH⁺.

(4) Between the initial point and the equivalence point, the solution contains a mixture of B and BH⁺.

(5) The pH at the equivalence point is more than 7.0. Your answer:
(A) (2), (4) and (5)；
(B) (1), (2) and (3)；
(C) (1),(3) and (4)；
(D) (1), (4) and (5)；
(E) The statements are all true.