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【简答题】
小明家里有一小袋粗盐，有一天他发现敞口放置的粗盐表面有溶解现象．经查阅资料得知，这种现象在化学上叫潮解，原因是粗盐中含有氯化钙和氯化镁．于是他设计了以下实验方案对粗盐进行提纯． 请回答实验中有关问题． （1）将粗盐全部溶于水，加入过量的氢氧化钠溶液，其主要目的是除去粗盐中的______； （2）再加入过量碳酸钠溶液，目的是除去粗盐中的______； （3）待充分反应后过滤，所得滤液中的溶质为______； （4）向滤液中加入适量的稀盐酸，完全反应后，加热、蒸发、结晶，得到几乎不含其他杂质的NaCl晶体．
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