There is a small amount of alcohol insoluble matter in the purification process of crude azobenzene. What substance could it be and how did it come into being?
First, the basic principle of separation and purification is to remove impurities mixed in substances, and to obtain pure substances is called purification; Separating different substances mixed with each other to obtain pure substances with corresponding components is called separation. Three principles should be followed when choosing reagents and experimental operation methods to solve the test questions of substance separation and purification: 1. No new impurities can be introduced.