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氯碱厂电解饱和食盐水制取NaOH的工艺流程示意图如下： 依据上图，完成下列填空： （1）与电源负极相连的电极附近，溶液pH值 （ 选填：不变、升高或下降），与电源正极相连的电极叫 极，检验该极上产物的方法是 。 （2）写出电解饱和食盐水的化学方程式 。 （3）如果粗盐中SO 含量较高，必须添加钡式剂除去SO ，该钡试剂可以是 （ 选填A.B.c，多选扣分） A．Ba(OH) 2 B．Ba(NO 3 ) 2 C．BaCl 2 （4）判断钡试剂已经过量的方法是 。 （5）为有效除去Ca 2+ 、Mg 2+ 、SO ，加入试剂的合理顺序为 （ 选填a，b，c多选扣分） A．先加NaOH溶液，后加Na 2 CO 3 溶液，再加钡试剂 B．先加NaOH溶液，后加钡试剂，再加Na 2 CO 3 溶液 C．先加钡试剂，后加NaOH溶液，再加Na 2 CO 3 溶液 （6）为检验精盐纯度，需配制150 mL0.2 mol/LNaCl（精盐）溶液，下图是该同学转移溶液的示意图，图中的错误是 。
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