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一、实验仪器及试剂实验仪器:试管、胶头滴管。实验试剂:碳酸钠溶液、澄清的石灰水。二、实验步骤九年级化学下册(人教版)第十一单元74面实验11-2。1.改进前:向盛有少量碳酸钠溶液的试管里滴入澄清的石灰水,观察并分析现象。实验效果:把澄清的石灰水滴进碳酸钠溶液中(碳酸钠溶液为2 mL),刚开始滴进几滴,没有沉淀(有时第一滴会看到一点沉淀,振荡后消失),大约10滴后才看到有少量浑浊,但不太明显。
First, the experimental equipment and reagents Experimental equipment: test tube, plastic head dropper. Experimental reagents: sodium carbonate solution, clarified lime water. Second, the experimental steps The ninth grade chemistry (PEP) eleventh unit 74 surface experiment 11-2.1. Before the improvement: to a small amount of sodium carbonate solution in the test tube dropping clear lime water observation and analysis phenomenon. Experimental results: The clarified limewater was dropped into a sodium carbonate solution (2 mL of sodium carbonate solution), initially dropping a few drops without precipitation (sometimes the first drop would see a little precipitate and disappear after shaking), about 10 drops After seeing a small amount of muddy, but less obvious.