問題詳情

25. Ca2+, Mg2+, and

are 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

參考答案

答案：A

統計：A:0,B:1,C:0,D:0,E:0

難度：計算中