论文部分内容阅读
电解质溶液中的离子平衡问题不仅是中学化学知识的重点,也是高考的热点和难点。本文对该理论中存在的一些极易混淆的几组概念进行了归纳和解析,以供广大学生参考。一、强与弱的对立1.溶于水全部电离的电解质是强电解质,电离方程式用“=”连接,不存在电离平衡;溶于水部分电离的电解质是弱电解质,电离方程式用“葑”连接,存在电离平衡,能够用化学平衡移动原理解释其电离平衡移动的方向。2.“有弱才水解,无弱不水解。”弱酸的酸根离子和弱碱金属阳
Ion balance in electrolyte solution is not only the focus of high school chemistry knowledge, but also hot and difficult college entrance examination. In this paper, there are some easily confused concepts that exist in the theory are summarized and analyzed for the majority of students for reference. First, the strong and weak opposition 1. Electrolytes dissolved in water are all ionized electrolyte is strong, ionization equation with “= ” connection, there is no ionization equilibrium; partially ionized water soluble electrolyte is weak electrolyte ionization equation with “葑 ” connection, there is ionization equilibrium, can explain the direction of ionization equilibrium movement using the principle of chemical equilibrium shift. 2. “Weak only hydrolysis, weak and not hydrolysis. ” Weak acid ion and weak alkali metal Yang