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阿Q吧 > 要使银离子,钡离子,镁离子等离子逐一形成沉淀析出，选择的试剂及加入顺序。为什么不可以颠倒。

要使银离子,钡离子,镁离子等离子逐一形成沉淀析出，选择的试剂及加入顺序。为什么不可以颠倒。

求助~~

2025-03-16 14:54:25

推荐回答（1个）

回答1：

方案1：NaCl → NaOH → Na2CO3
先用Cl-沉淀Ag+，再用OH-沉淀Mg2+，最后用SO42-沉淀Ba2+
因为OH-能沉淀Ag+、Mg2+，所以要先用Cl-除去Ag+
因为CO32-能与Ag+、Ba2+、Mg2+反应，所以沉淀Ba2+之前，必须把Ag+、Mg2+都沉淀下来。

方案2：NaCl → NaOH → Na2SO4 或NaCl → Na2SO4 → NaOH
SO42-只能与Ag+、Ba2+反应，所以沉淀掉Ag+后，先沉淀Mg2+还是先沉淀Ba2+无所谓。

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