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在学习九年级化学第六单元课题2“二氧化碳制取的研究”时,我把教学地点改在实验室中,给学生准备化学药品时,多准备了稀硫酸、碳酸钠和氢氧化钠溶液,让他们在预习的基础上自主地进行探究。在探究的过程中有学生问:“碳酸钠和碳酸钙都与稀盐酸反应生成二氧化碳,是不是它们组成里都含有碳酸根?”在肯定了他的回答后,另一个小组的学生问:“澄清的石灰水中含有氢氧化钙,氢氧化钠和氢氧化钙一样组成里都含有氢氧根,二氧化碳可以和氢氧化钙反应,那么它能不能和氢氧化钠反应呢?”这个问题已经涉及碱的化学性质了,以学定
When I was studying Chemistry 6, Unit 2, “Research on Carbon Dioxide Production,” I changed my teaching location to a laboratory where I prepared more chemicals for my students and prepared more dilute sulfuric acid, sodium carbonate, and sodium hydroxide Solution, let them explore on the basis of the preview. In the course of the inquiry, some students asked: “Both sodium carbonate and calcium carbonate react with dilute hydrochloric acid to produce carbon dioxide, do they all contain carbonate?” After affirming his answer, students in another group asked : “Clarified limewater contains calcium hydroxide, which contains hydroxide in the same composition as calcium hydroxide. Carbon dioxide reacts with calcium hydroxide. Can it react with sodium hydroxide?” The problem has already involved the chemistry of the base, to be determined