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【简答题】
工业上对海水资源综合开发利用的部分工艺流程如图所示． （1）粗盐中含有Ca 2+ 、Mg 2+ 、SO 4 2- 等杂质，粗制后可得饱和NaCl溶液，精制时通常在溶液中依次中加入过量的BaCl2溶液、过量的NaOH溶液和过量的Na 2 CO 3 溶液，过滤后向滤液中加入盐酸至溶液呈中性．请写出加入Na 2 CO 3 溶液后相关化学反应的离子方程式：______、______． （2）从海水中提取溴，主要反应为2Br - +Cl 2 =Br 2 +2Cl - ，下列说法错误的是______（填序号）． A．溴离子具有氧化性 B．氯气是还原剂 C．该反应属于复分解反应 D．Br 2 是氧化产物 （3）本工艺流程中先后制得Br 2 、CaSO 4 、Mg（OH） 2 ，能否按Br 2 、Mg（OH） 2 、CaSO 4 的顺序制备？______（填“能”或“否”），原因是______．
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