試題詳解

1. For gravimetric analysis and argentometric titration, which of the following statements are correct?
 (1) At the equivalence point, the pAgt is dependent of the original concentrations or volumes.
 (2) At the equivalence point, the pAgt can be found by the solubility product of the precipitate.
(3) The larger the equilibrium constant for a titration reaction, the more pronounced will be the change in concentration near the equivalence point.
 (4) The equivalence point is always at the center of the steepest section of the titration curve no matter of the stoichiometry of reactants.
 (5) The change in pAg⁺ at the equivalence point becomes greater as the solubility products become smaller. Your answer:
(A) (2), (4) and (5)；
(B) (2) and (3)；
(C) (2), (3) and (5)；
(D) (2) and (5)；
(E) The statements are all correct.