璀璨星云——乙醇凝胶的焰色与变色  

Bright Nebula:Flame and Color Change of Ethanol Gels

作　　者：魏莱 倪梅 刘妍岑 Lai Wei;Mei Ni;Yancen Liu(Department of Basic Courses,China Fire and Rescue Institute,Beijing 102202,China)

机构地区：[1]中国消防救援学院基础部,北京102202

出　　处：《大学化学》2023年第7期289-296,共8页University Chemistry

基　　金：中国消防救援学院基础部教学改革项目。

摘　　要：以超分子凝胶的制备为基础,结合焰色反应、酸碱指示剂变色和水解平衡移动等原理设计了一个综合性科普实验。实验采用乙酸钙水溶液和乙醇混合的方法制备凝胶,制备过程中加入金属盐(或硼酸)及酸碱指示剂,并调节酸碱性。制得的凝胶在燃烧时,金属盐(或硼酸)使火焰呈现出多彩的焰色,且受热导致凝胶中乙酸盐的水解平衡移动,使凝胶中的酸碱指示剂变色。整体实验效果绚丽多彩,如同璀璨的星云在宇宙中闪耀。本实验涉及知识点丰富,操作安全简便,现象明显,充分展现化学之美,满足不同人群的科普需求。The experiment is a comprehensive popular science experiment designed on the basis of supramolecular gels preparation,combining the two common principles of flame test and color change of indicator.In the preparation of gel,calcium acetate solution and ethanol were mixed first,metal salt(or boric acid) and acid-base indicator were added.When the gel was ignited,the gel showed colored flame because of the metal salt(or boric acid).The heat leads to hydrolytic equilibrium shift of acetate in the gel,leading to the color change of acid-base indicator in the gel.The exhibition effect of experiment is gorgeous and colorful,just like the bright nebula shining in the universe.The experiment is safe and easy to operate,involving rich knowledge,possessing obvious phenomenon,and showing adequately the beauty of chemistry,which can well meet the learning needs of different groups of people.

关 键 词：超分子凝胶 焰色反应 酸碱指示剂 化学科普 

分 类 号：G64[文化科学—高等教育学] O6[文化科学—教育学]