书写离子反应方程式是重要的知识技能之一,又是历届高考的热点。学生向来很注意培养这方面的技能,重视训练书写技巧,但在实际书写过程中,仍有不少学生感到把握性不大,书写是否正确,又缺乏判定能力。为了帮助同学们更好地掌握书写离子方程式的方法,现仍须提示大家注意下面几条书写规则。 一、易溶于水,易电离的物质要写成离子的形式;非电解质、难溶物质、难电离的物质和气体等都要用分子式表示 例1.碳酸钙与醋酸反应 Writing the equation of ion reaction is one of the important knowledge and skills, and it is also a hot spot in previous college entrance examinations. Students have always paid great attention to training the skills in this area, and have attached great importance to training and writing skills. However, in the actual writing process, many students still feel that they have little grasp, are writing correctly, and lack the ability to judge. In order to help students better understand the method of writing ion equations, we must still remind everyone to pay attention to the following writing rules. First, substances that are easily soluble in water and easily ionized are written in the form of ions; non-electrolytes, hardly soluble substances, and difficult-to-ionize substances and gases are to be represented by molecular formulas. Example 1. Reaction of calcium carbonate and acetic acid