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2018年中考化学真题分类汇编3化学实验与探究考点16常用的化学实验技能2除杂4流程图（无答案）.doc

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1常用的化学实验技能（18 长春）22某白色固体甲的主要成分为 NaCl，可能含有MgCl2、KCl、BaCl 2和 NaOH中的一种或几种杂质，为检验白色固体甲的成分并除去其中杂质，进行如下实验：（1）写出生成白色固体丙的化学方程式 ；（2）向无色溶液 D中加入过量稀盐酸的目的是 ；（3）分析上述实验可知，白色固体甲中一定没有的物质是 ；（4）若用上述实验中的 A、B、C、D 四种溶液鉴别稀 H2SO4和 NaOH溶液，分别取样后，按下图所示操作进行实验，就能达到鉴别目的的是实验 。2

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