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The Marathon

The marathon is the longest race at the Olympics. You have to be a very strong runner to win the marathon.

The marathon is 42.195 km long. Why is it 42.195 km and not 43? The 1908 Olympics was in London. The King of England wanted his children to watch the marathon so the race started at the gate of his palace. From there to the finish line was 42.195 km.

One of the best marathon runners was Abebe Bikila. He was from Ethiopia. He won the gold medal in the marathon at the 1960 Olympics. He ran the whole race without shoes on!

实验室有一久置的生石灰样品，科学小组同学利用该样品进行了一系列探究活动，具体操作步骤如下：

①称取0.75克样品，加足量的水充分溶解，过滤得滤液A和0.1克沉淀B。

②将滤液A等分成2份，一份先加少量酚酞试液再滴加稀盐酸至过量，得混合物C，另一份加过量的碳酸钠溶液，得混合物D。                                                      

③将混合物C、D倒入一个洁净的烧杯中，发先烧杯中有白色沉淀且上层清液呈红色，过滤，得滤液E和1g滤渣。

④向滤液E中滴加CaCl₂溶液，有白色沉淀生成。

（1）则滤液E中一定含有的溶质是　　。

（2）根据实验现象及数据判断，原样品的成分是　　。