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1998年高中毕业会考化学实验操作考查的是：通过实验体现如下变化：Ca（OH）2→CaCO→Ca（HCO3）2→CaCO3笔者参加了这次实验考查，发现半数同学在实验由CaCO3→Ca（HCO3）2的转变中出现问题：CaCO3没变成Ca（HCO3）2，而是沉淀了下来，这直接影响整个实验的成功．那么，该实验
In 1998, the high school graduation exam chemistry experiments were examined as follows: The experiment showed the following changes: Ca(OH)2→CaCO→Ca(HCO3)2→CaCO3 The author participated in this experiment and found that half of the students in the experiment consisted of CaCO3→Ca. There was a problem in the conversion of (HCO3)2: CaCO3 did not become Ca(HCO3)2, but precipitated, which directly affected the success of the entire experiment. So, this experiment