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【简答题】
某固体混合物可能由NaCI、K 2 SO 4 、CuCl 2 、CaCl 2 、K 2 CO 3 中的一种或几种混合而成，为鉴定其组成，依次进行如下实验： 混合物中加入足量水得到无色透明溶液； （2）上述溶液中滴加BaCl 2 有白色沉淀产生； （3）过滤，然后向上述白色沉淀中加盐酸时，沉淀全部溶解； （4）往滤液中加AgNO 3 溶液时有白色沉淀产生且白色沉淀不溶于稀硝酸。 试判断：①肯定存在的物质有____________________________________； ②肯定不存在的物质有_______________________________; ③可能存在的物质有______________________________; ④写出第（4）步实验中发生反应的离子方程式：__________________________________。
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