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培养学生具有一定的化学计算技能,为他们毕业以后参加三大革命实践和进一步学习打下良好的基础,这是化学教学的一项重要任务。这里,仅就溶液浓度和根据化学方程式计算中的一些值得注意的问题,分析四道例题,供参考。例题1 比重1.84的硫酸,其百分比浓度是96％,求其当量浓度。解这道题,首先要明确“当量浓度”的概念。它是指1升溶液中所含溶质的克当量数,用克当量/升表示,简记为Ⅳ。还要明确“克当量”的概念,了解硫酸的一个克当量为49
Cultivating students has a certain amount of chemistry calculation skills, laying a good foundation for them to participate in the three revolutionary practices and further study after graduation. This is an important task of chemistry teaching. Here, four examples are analyzed for the solution concentration and some of the noteworthy issues in the calculation of the chemical equation for reference. Example 1 Sulfuric acid with a specific gravity of 1.84 has a percentage concentration of 96%, and the equivalent concentration is required. To solve this problem, we must first clarify the concept of “equivalent concentration.” It refers to the gram equivalent of solute contained in a liter of solution, expressed in gram equivalents per liter, abbreviated as IV. It is also necessary to clarify the concept of “gram equivalent” and understand that one gram equivalent of sulfuric acid is 49