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在教学中发现,不少同学在解题过程中对HNO3的氧化性特征具有敏锐的洞察力,但对酸性条件下的硝酸盐同样也有氧化性却茫然无知而出错.现以典型习题为例,就解答有关NO3-题的常见错误作一浅析,供同学们参考. 一、错误出现在物质量的比较中 例1 向盛有10g Cu、Ag混合物粉末的烧杯中加入10 mL稀HNO3,充分反应后,剩余金属m1g.再向其中加入10mL稀H2SO4,长时间振荡后余下金属m2g,则m1与m2之间关系一定正确的是().
In the course of teaching, many students have a keen insight into the oxidative characteristics of HNO3 in the process of solving problems, but nitrates in acidic conditions are also oxidative but utterly ignorant and mistakes. Now take typical exercises as an example. Answer to the common mistakes of NO3-questioning for students’ reference. First, the error occurs in the comparison of the substance. Example 1 Add 10 mL dilute HNO3 to a beaker containing 10 g of Cu, Ag mixture powder. After the reaction, the remaining metal m1g. Then add 10mL diluted H2SO4, after a long period of oscillation after the remaining metal m2g, then the relationship between m1 and m2 must be correct ().