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混合物的分离与除去混合物的杂质,原理都是通过物理的或者化学的方法把混合物中无用的杂质转化成与混合物所处状态不同的物质,使其除去或者是把混合物中的杂质转化成另一种有用物质的一种实验操作方法。既固态混合物往往是将杂质转化成气态或液态而除去,液态混合物是将杂质转化成气态或固态而除去,气态混合物是将杂质转化成固态或液态除去。比如:除去空气中的氧气就是用磷将空气中的氧气通过化学变化转化成固态的五氧化二磷而被除去。除去混合物中的杂质要注意的事项:在除杂时要注意以下两点(也是分析这类习题时最易出现错误的地方)。
The separation of the mixture and the removal of the impurities in the mixture are based on the principle that the undesired impurities in the mixture are converted into substances different from the state of the mixture by physical or chemical means to remove or convert the impurities in the mixture into another An experimental method of using useful substances. The solid mixture is often removed by converting the impurities into a gaseous or liquid state, which is removed by converting the impurities into a gaseous or solid state that is converted by the gaseous mixture to a solid or liquid state. For example: to remove oxygen in the air is to use phosphorus to oxygen in the air through chemical changes into solid phosphorus pentoxide and was removed. Remove impurities in the mixture Matters needing attention: When removing impurities should pay attention to the following two points (also the most prone to error when analyzing such exercises).