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甲基橙是常用酸碱滴定的指示剂,它是由对氨基苯磺酸经重氮化后与二甲基苯胺偶联而成。学生通过做此实验可以熟悉低温下重氮化和偶联的操作技术。由于一些统编有机化学实验教材缺乏全面的阐明,致使实验的效果不够理想。通过多年的实验摸索,针对甲基橙在遇湿、高温、碱性时易变质和颜色变深的特性,使学生实验中所制得的甲基橙产物不致变为紫红甚至褐黑色,可从下述几个方面加以改进:
Methyl orange is commonly used indicator of acid-base titration, it is by the para-aminobenzenesulfonic acid after diazotization coupled with dimethyl aniline. Students can familiarize themselves with diazotization and coupling techniques at low temperatures by doing this experiment. Due to the lack of comprehensive elucidation of some compilation of organic chemistry experiment teaching materials, the experimental results are not satisfactory. Through many years of experiments and exploration, in the event of wet, high temperature, alkaline metamorphic metamorphic and darken the characteristics of the methyl orange students in the experiment will not produce methyl orange products even become purple or brown, from The following aspects to be improved: