学生进入高中化学的学习过程后,大多数学生对“有关溶液中离子能否共存问题”感觉不会做,即便有时做对了,也感觉心中没底,模模糊糊.然而这类题目是中学化学中的常见问题.近几年高考几乎每年都有判断离子大量共存的问题.从历年高考中有关离子共存问题的难度上分析,这类问题都属于中等难度偏易题,但这类题的区分度都比较高.也就是说,题不难,但考生在这类题上能否得分差异较大.造成这种状况的原因,主 Students into the high school chemistry learning process, most students feel “will not do” on whether the ions in solution can coexist problems, even though sometimes right, feel the bottom of the heart, vague, but such problems Is a common problem in middle school chemistry.In recent years, college entrance examination almost every year to determine a large number of ions coexist issues.From the calendar year college entrance examination on the coexistence of ions on the difficulty of analysis, these problems belong to the more difficult problems, but these That is, the title is not difficult, but the candidates in such questions whether the score difference is larger .This caused the reason of the situation, the main