守恒思想是一种重要的思想方法,在化学解题中一直受到人们的关注,其中综合运用质量守恒、能量守恒、电子守恒、电荷守恒、质子守恒等多种守恒来解决问题,越来越受到人们的青睐,而这些常常是学生学习中的难点.现举例分析,供同学们学习时参考.例1已知铁溶于一定浓度的硝酸中发生 Conservative thinking is an important way of thinking. It has attracted people’s attention in the chemical problem solving. The comprehensive use of conservation of mass, conservation of energy, conservation of electrons, conservation of charge, conservation of protons, etc. to solve problems is increasingly being addressed. People’s favor, and these are often difficult for students to learn. Examples are now analyzed for reference when students learn. Example 1 It is known that iron dissolves in certain concentrations of nitric acid.