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所谓中间值就是一列数据里中间的那个数值。下列通过实例来说明它在解混合物计算题中的应用及其解题过程。例1取12.7克含有一种杂质的氯化亚铁溶解于水，并与足量硝酸银溶液反应，得到30克氯化银沉淀。则氯化亚铁中含有的杂质是（）。（A）NaCl（B）CuCl2（C）BaCl2（D）KCl解
The so-called median is the value in the middle of a column of data. The following is an example to illustrate its application in solving mixtures calculation problems and the problem-solving process. Example 1 12.7 g of ferrous chloride containing an impurity was dissolved in water and reacted with a sufficient amount of silver nitrate solution to obtain 30 g of a silver chloride precipitate. The impurity contained in ferrous chloride is (). (A) NaCl(B)CuCl2(C)BaCl2(D)KCl solution