試題詳解

25. Ca²⁺, Mg²⁺, andare removed when purifying crude salt (NaCl) in the laboratory. Which of the following reagents are needed in addition to BaCI₂?
(A) Na₂CO₃, NaOH, and HCl
(B) Na₂CO₃, HCI, and KOH
(C) K₂CO₃, HNO₃, and NaOH
(D) Na₂CO₃, NaOH, and HNO₃
(E) K₂CO₃, HCI, and KOH