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根据物质的性质,采用物理方法或化学方法把混合物中的杂质分离出去,从而得到一种较为纯净的物质,这在化学中叫做物质的提纯或除杂。一、物理除杂的方法1.溶解过滤法原理:把不溶于液体的固体与液体通过过滤而分开的方法称为过滤法。例1:粗盐的提纯。[解析]通过溶解——过滤——蒸发,即得到纯净的氯化钠。练习1:怎样除去氯化钙中含有的少量碳酸钙杂质?如果是碳酸钙中
Depending on the nature of the substance, the impurities in the mixture are physically or chemically separated to give a purer substance, which is called chemical purification or impurity removal. First, the method of physical impurity 1. Dissolve the principle of filtration: The method of separating the solid and liquid insoluble in the liquid through the filtration is called the filtration method. Example 1: Purification of crude salt. [Analytical] Pure sodium chloride is obtained by dissolution-filtration-evaporation. Exercise 1: How to remove small amounts of calcium carbonate contained in calcium chloride impurities? If it is calcium carbonate