試題詳解

20. Which of the following statements concerning titration are INCORRECT?
(A) The pH at the midpoint, the point halfway on the titration curve to the equivalence point, is equal to the pK_a of the weak acid.
(B) The pK_a values of a diprotic acid H₂A are= 8.00. At pH 9.00, the major species are
(C) The equivalent volume for titrating 50.00 mL of a solution (0.05 M in iodide ions and 0.08 M in chloride ions) with 0.1 M silver nitrate is 60 mL.
(D) In EDTA titration, ammonia often is required to prevent the precipitation of metal ions.