离子方程式与离子共存问题是中学化学的重点和难点,也是每年高考的必考点。其中,离子方程式的书写与正误判断涉及的知识面比较广,对考生的要求也比较高。本期所刊登的三篇文章,主要是针对高考中考查离子方程式的热点、离子方程式的书写及常见错解以及离子共存问题作出分析,希望能帮助同学们更好地掌握本部分知识,提高学习成绩。 The coexistence of ion equations and ions is the focus and difficulty of middle school chemistry, and it is also a must for college entrance examinations. Among them, the writing of ion equations and the correctness of judgments involve a wider range of knowledge and higher requirements for examinees. The three articles published in this issue mainly aim at examining the hot spots of ion equations in the college entrance examination, the writing of ion equations, common misconceptions, and ion coexistence problems, hoping to help students better master this part of the knowledge and improve learning. Achievements.