試題詳解

23. You titrated 15 mL of 0.01 M NaCl, NaBr, and NaI solutions with 0.1 M AgNO₃ solution, respectively, and used an Ag₂S electrode to monitor the change in Ag⁺ concentration during the titration. The measured Ag₂S electrode potential ( E ) versus the volume (V)of AgNO₃ solution consumed is shown on the right. It is known that the electromotive force of Ag₂S electrode increases with the increase of [Ag⁺ ], and the produced silver halide by titration exists as a colloid. Which of the following statements is correct?
(A) The titration of NaCl solution is curve I.
(B) Q is the titration end point.
(C) The [Ag⁺ ] at Q is 0.1 M.
(D) From the figure, it can be seen that the silver halide colloid particles mainly adsorb Ag⁺.
(E) This method can be used to determine the concentration of halide ions in solution.