溶液中的离子共存问题综合性较高,有些同学不清楚哪些离子之间能发生反应,哪些离子之间不会发生反应,易出现错误.近年来离子反应、离子不能大量共存的考查不仅在向深度和广度发展,而且着重技巧和能力的考查.因此在复习中除要将基本问题弄清处外,还特别要注意题中隐含的不易察觉的信息. The problem of ion coexistence in solution is more comprehensive, some students do not know which ions can react with each other, and which ions do not react with each other and are prone to error. In recent years, ion reaction, ions can not coexist in a large number of tests not only in Depth and breadth of development, but also focus on skills and ability tests, so in addition to review the basic issues to be clarified, but also pay special attention to the implied imperceptible message.