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（6分）某校化学兴趣小组的同学探究如何利用水垢制取氯化钙。水垢的主要成分是CaCO 3 和Mg(OH) 2 ，由水垢制取氯化钙的流程如下： 请回答： （1）“试剂A”是一种酸，其化学式为 。 （2）“试剂B”是氢氧化钙，加入其除去的主要杂质离子是 ，所发生反应的化学方程式为 ；“试剂B”不能选用氢氧化钠，理由是 。 （3）“酸化”的主要目的是 。 （4）“操作1”中，需要用到的玻璃仪器除烧杯、玻璃棒外，还有 。
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