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实验室中验证乙烯性质时,一般用浓硫酸作脱水剂,采用乙醇分子内脱水的办法制取乙烯,验证其与溴、高锰酸钾的反应及其可燃性。但在实验过程中,常出现以下现象:炭化严重;溴水、高锰酸钾溶液褪色慢;高锰酸钾褪色后有棕黑色沉淀;乙烯燃烧时,火焰颜色接近H2,CO等气体燃烧时特有的蓝?
When verifying the properties of ethylene in the laboratory, concentrated sulfuric acid is generally used as a dehydrating agent, and ethylene is used to produce ethylene by intramolecular dehydration to verify its reaction with bromine and potassium permanganate and its flammability. However, in the course of the experiment, the following phenomena often occur: carbonization is severe; bromide water and potassium permanganate solution fade slowly; brown potassium black precipitates after potassium permanganate bleaching; when the ethylene burns, the flame color approaches H2, when CO and other gases are burned Unique blue?