試題詳解

32Which of the following statements associated with titration is (are) CORRECT?
(i) Titrations with NaOH are called argentometric titrations
(ii) In the Vohhard method, Fe³⁺ serves as the indicator
(iii) Zn²⁺ ions are titrated with EDTA in an ammonia/ammonium chloride buffer. The role of ammonia is to avoid the precipitation of Zn²⁺ ions.
(iv) The bromate titration method is commonly performed in a basic solution.
(A) i, ii, iii, iv
(B) iii, iv
(C) ii, iii,
(D) ii, iii, iv
(E) ii