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1.溶解法如果混合物中的杂质能和某种试剂反应而被“溶解”掉,而“主成分”却不反应,则可采用溶解法除杂.例1要除去银粉中的少量铁粉,可加入的试剂是.解析:把混合物放入一烧杯中,滴加稀盐酸,充分反应至不再产生气泡,过滤,将滤渣洗涤、干燥,即可得到纯净的银粉.化学方程式为Fe+2HCl=FeCl2+H2.
1. Dissolution method If the impurities in the mixture can react with a certain reagent and be dissolved, but the “main component” does not react, then the dissolution method can be used to remove impurities. Example 1 to remove the silver powder A small amount of iron powder can be added to the reagent. Analysis: Put the mixture into a beaker, add dilute hydrochloric acid dropwise, fully react until no bubbles are formed, filter, wash the filter residue, and dry it to obtain pure silver powder. Chemical Equation Fe+2HCl=FeCl2+H2.