試題詳解

17. The pH meter is widely used for measuring the H⁺ concentrations in the solutions. Which one of the following descriptions for a pH is incorrect?
(A) The sensing material is a special thin glass membrane at the tip of the electrode.
(B) No reference electrode is required for a pH meter.
(C) The real signal obtained from the pH meter is voltage (or difference of potentials).
(D) In basic solutions, the indicator electrode also responds to alkali metal ions.
(E) pH meters can be used to determine the equivalence point of the acid-base titration.