反应后溶液百分比浓度计算题综合性强、难度较大,具有一定的选拔功能。所以,在中考试题和竞赛试题中都不同程度地出现了这类题,以考查学生的分析能力、综合能力和应用能力。现将这类题归类、分析如下。1 反应后无气体和沉淀生成 例1 9.8％的稀硫酸20克,跟一定质量的氢氧化钠固体恰好完全反应。求反应后所得 After the reaction, the solution percentage concentration calculation problem is comprehensive and difficult, and has a certain selection function. Therefore, such questions have appeared in varying degrees in the mid-test questions and competition questions to examine the students’ analytical ability, comprehensive ability and application ability. These types of questions are now categorized and analyzed as follows. 1 After the reaction, there was no gas and precipitation. Example 1 A dilute sulfuric acid solution of 9.8% was reacted exactly with a certain amount of sodium hydroxide solids. Seek after reaction