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现行高中化学第一册课本第26～30页,氯气的实验室制法及性质的演示实验7个,约占全册书演示实验的1/7。为了提高演示实验效果,保护师生的健康,我对该演示实验作了改进,采取半封闭式装置,一次完成了7个演示实验。 实验步骤: 1.取六只具支试管用玻管胶管和氯气发生装置串联,在2—6个试管中依次放入干布条,湿布条、铜粉、红磷和水。 1.缓缓加热二氧化锰和浓盐酸的混和物,使反应加速,让氯气均匀地放出,依次通过六只试管,充满氯气后多余的氯气用碱液吸收。
On the 26th to 30th pages of the current High School Chemistry Book No. 1 textbook, there are seven demonstration experiments and the nature of laboratory tests for chlorine gas, accounting for about 1/7 of the entire book demonstration experiment. In order to improve the effectiveness of demonstration experiments and protect the health of teachers and students, I improved the demonstration experiment and adopted a semi-closed device to complete 7 demonstration experiments at a time. Experimental procedure: 1. Take six tubes with glass tubes and chlorine generators in series. Place 2-6 tubes in the order of dry cloth, wet cloth, copper powder, red phosphorus and water. 1. Slowly heat the mixture of manganese dioxide and concentrated hydrochloric acid to accelerate the reaction. Let the chlorine gas be released evenly. Pass through the six test tubes in sequence. The excess chlorine gas will be absorbed by the lye after being filled with chlorine gas.