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常温下,配制饱和碳酸钠溶液,然后向少量该溶液中通入用大理石和稀盐酸(1:4)反应产生的二氧化碳气体,理论上有碳酸氢钠沉淀产生,但实验中却始终没有产生沉淀。改用雪碧中的二氧化碳气体通入饱和碳酸钠溶液中很长时间,仍然没有出现沉淀,问题出在哪里?课堂上我们对这个问题进行了探究。
At room temperature, a saturated sodium carbonate solution was prepared, and then a small amount of this solution was bubbled through a carbon dioxide gas produced by the reaction of marble with dilute hydrochloric acid (1: 4). In theory, sodium bicarbonate was precipitated but no precipitate was formed during the experiment . Switch to the carbon dioxide gas sparge access to saturated sodium carbonate solution for a long time, there is still no precipitation, the problem lies in the classroom we have to explore this issue.