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饱和食盐水为什么能吸收氯化氫？

返回打印发布时间：2023/7/10 点击：10636

饱和食盐水为什么能吸收氯化氫？

这是因为氯化氫在饱和盐水中的溶解度很高，因此很容易溶于饱和盐水中，而氯气则不易溶于饱和浓盐酸中，因此可以用饱和盐水去除混入氯气中的氯化氫气体。

氯化氫化学性质：

氯化氫是一种腐蚀性不燃气体，不与水反应但易溶于水，常以盐酸烟雾的形式存在于空气中。溶于乙醇和乙醚，也溶于许多其他有机物质；易溶于水，在25℃、1个大气压下，1体积的水可溶解503体积的氯化氫气体。干燥的氯化氫化学性质非常惰性。碱金属和碱土金属在氯化氫中易燃，钠燃烧时放出亮黄色火焰。

氯化氫的水溶液是盐酸。工业盐酸常呈微黄色，主要是由于氯化铁的存在。检测盐酸是否存在的常用方法是氨水，它与氯化氫反应形成白色氯化铵颗粒。氯化氫具有很强的偶极子，并与其他偶极子形成氢键。

实验室制备氯化氫的方法：

一般采用固体氯化钠与浓硫酸不加热或微加热反应，分别生成硫酸氢钠和氯化氫。

NaCl+H2SO4=NaHSO4+HCl↑

然后，在500℃～600℃的条件下继续反应，生成氯化氫和硫酸钠。

NaHSO4+NaCl=Na2SO4+HCl↑

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