Study of Unconventional Valence Compounds of Manganese Elements
College of Teacher Education, Southwest University, Chongqing 400700, China
| Abstract: | Manganese is an important metal element and is widely used in various fields such as industry and medicine. However, there is a lack of systematic introduction of manganese and its compounds in secondary school textbooks The purpose of the experiment is to prepare several unconventional valence compounds of manganese elements, to clarify the intrinsic connection between the oxidation states of manganese, and to help students recognize the various oxidation states of manganese. In this study, three sets of experiments on the interconversion of different valence states of manganese elements were designed, involving the knowledge of redox reactions, reversible reactions and coordination compounds, and the products were analyzed by UV-Vis spectrophotometer. The results showed that the unstable blue potassium manganate (V) was prepared from potassium manganate (VI) and manganese dioxide under strong alkaline conditions. Potassium permanganate and concentrated sulfuric acid under different conditions produced relatively stable red manganese trioxide and trivalent manganese ions, respectively, with rich color changes. This can provide experimental evidence for students to feel the transformation process of various oxidation states of manganese element, and also can effectively stimulate students' interest in learning. |
| Keywords: | Potassium Manganite (V); Threemanganese Trioxide; Trivalent Manganese Ion; Coordination Compounds; Comproportionation Disproportionation Reaction |
| DOI: | 10.57237/j.edu.2022.01.011 |
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Received: 29 September 2022
Accepted: 9 November 2022
Published Online: 23 November 2022
Funding
| 1. | 2021重庆市高等教育教学改革研究项目 (212024) |
| 2. | 2021年重庆市儿童发展与教师教育研究中心重点项目 (JSJY2104) |
| 3. | 中国教育学会2021年度教育科研规划项目 (202100170809B) |
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