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为什么饱和盐水可以吸收氯化氫？

返回打印发布时间：2022/6/16 点击：10598

饱和食盐水为什么能吸收氯化氫？在弄清楚这个问题之前，先了解一下氯化氫的化学性质。

氯化氫，腐蚀性不燃烧气体、水不反应但容易溶解于水中，在空气中多以盐酸烟的形式存在。易溶于乙醇和乙醚，也易溶于许多其他有机物的水中，在25和1个大气压下，整体积水可溶解503体积的氯化氫气体。干燥氯化氫的化学性质很惰性。碱金属和碱土金属可以在氯化氫中燃烧，钠燃烧时发出明亮的黄色火焰。

氯化氫的水溶液是盐酸。工业盐酸之所以总是呈微黄色，主要是因为氯化铁的存在。氨水常用于检测盐酸的存在，氨水与氯化氫反应生成白色氯化铵微粒。氯化氫有很强的偶极，会和其他偶极发生氢键。

为什么饱和食盐水能吸收氯化氫？这是因为氯化氫在饱和食盐水中的溶解度大，所以容易溶解在饱和食盐水中，而氯气难以溶解在饱和浓盐酸中，因此可以用饱和食盐水除去混入氯气中的氯化氫气体。

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