在初中化学学习中经常会遇到一些溶液除杂的题型,有少数是除去溶液中的不溶性杂质,运用过滤的方法就可以达到目的。但大多数是要求除去溶液中的可溶性杂质,这让很多学生无从下手,即使做了也是劳而无功。有的加入除杂物质后根 In junior high school chemistry often encounter some problems in the solution of impurities, a few remove the insoluble impurities in the solution, the use of filtration methods can achieve their goals. But most require the removal of soluble impurities in the solution, leaving many students unwilling to do so, even when done. Some add impurities after the roots