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鹽酸是化合物嗎？

返回打印发布时间：2023/7/25 点击：9153

化合物是由两种或多种不同元素组成的纯物质。盐酸是氯化氫的水溶液，含有水和氯化氫，所以盐酸是混合物，而不是化合物。

鹽酸是化合物嗎？

化合物是由两种或多种不同元素组成的纯物质（不同于单质）。盐酸含有水和氯化氫，不是化合物，而是混合物。盐酸的性状为无色透明液体，有强烈的刺激性气味，有较高的腐蚀性。

盐酸的物理性质：

盐酸是无色液体（工业盐酸因铁盐杂质会略带黄色）。它是氯化氫的水溶液，有刺激性气味。一般实验室使用的盐酸为0.1mol/L，pH=1。由于浓盐酸具有挥发性，挥发出来的氯化氫气体与空气中的水蒸气发生反应，形成细小的盐酸液滴，所以会看到白雾。盐酸与水、乙醇任意混溶，浓盐酸稀释时放出热量，氯化氫溶于苯。

化合物和混合物的区别：

1、化合物组成元素的性质不再保持单一物质状态；混合物没有固定的性质，每种物质都保持其原有的性质（例如没有固定的熔点和沸点）。

2、化合物的组成元素必须通过化学方法分离；

3、化合物的组成通常是恒定的。混合物是不同物质的混合物，没有确定的组成，不能用化学式表示。

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