試題詳解

11. A solution contains cations Ag⁺, Pb²⁺, and Ni²⁺. Dilute solutions of NaCl, Na₂SO₄, and Na₂S are available to separate the cations from each other. In order to effective separation, the solutions should be added in which order?
(A) Na₂S, NaCl, Na₂SO₄
(B) Na₂SO₄, NaCl, Na₂S
(C) Na₂SO₄, Na₂S, NaCl
(D) NaCl, Na₂S, Na₂SO₄
(E) NaCl, Na₂SO₄, Na₂S