离子方程式的书写是高中化学教学的重点、难点和考生的易错点,特别是近几年,离子方程式的考查从定性到定量成为高考的热点。而与量有关的离子方程式的书写是离子方程式的书写中最难的一种题型。通常有两种题型。一、过量型离子方程式的书写书写过量型离子方程式的关键:通常取量少物质1mol,让量少的物质反应完,写出反应需要的其他离子的 Ion equation writing is the focus of high school chemistry teaching, difficult and candidates error-prone, especially in recent years, the ion equation test qualitative to quantitative become the hot spot for the college entrance examination. The amount of ion-related equation writing is one of the most difficult questions in writing ion equations. There are usually two questions. First, the excessive ion equation writing Writing excess ion equation is the key: usually take a small amount of material 1mol, so that less the amount of material reaction finished, write out the reaction needs of other ions