“要给学生一杯水,教师要有一桶水。”我曾听一位老师讲解乙酸乙酯的制备时,有学生问:“为什么碳酸钠饱和溶液能降低乙酸乙酯的溶解度呢?”这位老师这样回答:“盐类物质降低物质的溶解度是很常见的,如NaCl降低Cl_2的溶解度,NaHCO_3降低CO_2气体的溶解度。这些都是实践经验,是实验事实,没有什么为什么的。”其实Na_2CO_3能降低乙酸乙酯的溶解度是可以用相似相 “To give the students a glass of water, the teacher should have a bucket of water. ” I once heard a teacher explain the preparation of ethyl acetate, a student asked: “Why sodium carbonate saturated solution can reduce the solubility of ethyl acetate? ”The teacher replied: “ Salt substances reduce the solubility of substances is very common, such as NaCl to reduce the solubility of Cl_2, NaHCO_3 to reduce the solubility of CO_2 gas. These are practical experience, is the experimental fact, there is nothing why . ”In fact Na_2CO_3 can reduce the solubility of ethyl acetate is similar to the phase