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把二氧化碳通入紫色石蕊试液，再加热试液，石蕊试液的颜色变化为（ ） A．先变红后变紫 B．先变蓝
把二氧化碳通入紫色石蕊试液，再加热试液，石蕊试液的颜色变化为（ ） A．先变红后变紫 B．先变蓝
2025-03-16 13:35:25
推荐回答（1个）
回答1：
二氧化碳能与水反应生成碳酸，碳酸具有酸性，能使石蕊试液变红，碳酸不稳定，受热易分解，酸性消失，试液有红变紫，观察选项，故选A．
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