某无色溶液中可能含有Na
+、K
+、NH
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmn%3E4%3C%2Fmn%3E%3Cmtext%3E%2B%3C%2Fmtext%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
、Mg
2+、Cu
2+、SO
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmn%3E4%3C%2Fmn%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
、SO
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmn%3E3%3C%2Fmn%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
、Cl
-、Br
–、CO
![](https://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsubsup%3E%3Cmrow%3E%3C%2Fmrow%3E%3Cmn%3E3%3C%2Fmn%3E%3Cmrow%3E%3Cmn%3E2%3C%2Fmn%3E%3Cmtext%3E-%3C%2Fmtext%3E%3C%2Fmrow%3E%3C%2Fmsubsup%3E%3C%2Fmrow%3E%3C%2Fmath%3E)
中的若干种,各离子浓度均为 0.1mol•L
-1。往该溶液中加入过量的BaCl
2和盐酸的混合溶液,无白色沉淀生成。某同学另取少量原溶液,设计并完成如下实验:
则关于原溶液的判断中正确的是( )
- A、无法确定原溶液中是否存在Cl-
- B、若步骤中 Ba(NO3)2 和 HNO3的混合溶液改用 BaCl2和盐酸, 则对溶液中离子的判断无影响
- C、肯定存在的离子是NH
、Mg2+、SO
、Br– - D、是否存在 Na+ 、K+需要通过焰色反应来确定