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.