探究铁和浓硝酸发生钝化后溶液显黄色的原因  

Exploring the Causes of Yellow Solution After the Reaction Between Iron and Concentrated Nitric Acid

作　　者：温利权[1] 左京平 李悦 WEN Li-Quan;ZUO Jing-Ping;LI Yue(Beijing No.2Middle School,Beijing 100010,China;Beijing Dongcheng District Teaching and Research Center,Beijing 100009,China)

机构地区：[1]北京市第二中学,北京100010 [2]北京市东城区教育科学研究院,北京100009

出　　处：《化学教育（中英文）》2024年第21期108-112,共5页Chinese Journal of Chemical Education

基　　金：北京市教育科学“十四五”规划课题“集团化办学背景下的化学校本课程体系研究与教学实践探索”(课题编号:CDDB23243)。

摘　　要：“铁被浓硝酸钝化”是高中化学重要的元素化合物知识,但钝化后溶液的变化少有关注,溶液颜色变为黄色也未被讨论过。实验表明,铁在浓硝酸中发生钝化后溶液中除了未反应的硝酸外,还含有Fe^(3+)、NO_(2)等微粒,溶液显黄色是多种物质综合作用的结果,还可能与NO_(2)^(-)等含氮化合物有关。根据“黄色溶液”的成因,对铝在浓硝酸中发生钝化后得到无色溶液的原因进行了合理推测。“Passivation of iron in concentrated nitric acid solution”is familiar knowledge of elemental compounds,but the yellow solution after the reaction has received less attention and discussion.The experimental results show that the interaction of various substances causes the yellow solution,such as unreacted concentrated nitric acid,Fe^(3+)and NO_(2),as well as the possible nitrogen compounds products in the reaction.After that,a reasonable explanation is presented on the colorless solution formed by aluminum passivation in concentrated nitric acid.

关 键 词：实验探究 铁 浓硝酸 钝化 

分 类 号：G633.8[文化科学—教育学]