论文部分内容阅读
高中化学第二册127页有这样一段话:“同一弱电解质,通常是溶液越稀,离子相互碰撞而结合成分子的机会越少,电离度越大。”一些学生想不通,认为根据刚学过的有关化学平衡的知识,加水稀释,弱电解质分子(反应物)浓度减小,有利于平衡向离子结合成分子的方向移动。按这个道理,电离度应该变小,怎么会变大呢? 又有一些教参和学习辅导材料,常以醋酸为例讲述弱电解质的电离平衡: CH_3COOH+H_2O=CH_3COO+H_2O~+并将水看成是反应物,认为加水稀释,就是增加了
There is a saying on the 127th page of the second high school chemistry book: “The same weak electrolyte, usually the thinner the solution, the less the chance that the ions will collide with each other and combine the molecules, and the greater the degree of ionization.” Some students can’t figure it out and think that according to just learning The knowledge about the chemical equilibrium is diluted with water, and the concentration of weak electrolyte molecules (reactants) is reduced, which helps to balance the movement of the ion-bound molecules. According to this principle, the degree of ionization should become smaller, and how can it become larger? There are also teaching materials and learning guidance materials. We often use acetic acid as an example to describe the ionization balance of weak electrolyte: CH_3COOH+H_2O=CH_3COO+H_2O~+ and water As a reactant, it is thought that adding water to dilution means increasing