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（1）下图是初中化学学习中的常见装置，请按要求回答下面问题： ①利用上述装置的组合可以制取的气体有______，写出其中一种气体制备的化学反应原理______． ②有的同学认为装置E可以代替装置B、C、D收集气体，欲收集具备下面性质的气体，使用装置E？ 比空气重的气体：______； 收集难溶性气体：______． ③装置E还具有其他用途，请举一例说明：______． （2）小明同学在使用“除垢净”去除热水瓶中的水垢时，发现有大量的气泡产生．联想水垢的主要成分是碳酸钙，小明猜想“除垢净”的成分中可能有酸． ①为证实自己的猜想，小明从家中又找来两类不同的物质进行实验： 实验一：______； 实验二：______． 经实验，小明得出“除垢净”的有效成分中一定有酸的结论． ②小明想试制一瓶“除垢净”，你认为HCl、H 2 SO 4 两种酸中的______更合适，理由是______． ③结合上面对“除垢净”的了解，在使用“除垢净”注意______．
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