现行中师化学教材中有关浓硫酸的氧化性实验存在以下几个问题：1．试管口敞开，产生的有刺激性臭味的二氧化硫逸散到空气中令师生咳嗽不止，并造成环境污染。2．用品红试纸检验二氧化硫效果木明显，后排同学不易看清楚。3．加热铜丝与浓硫酸的混合物，反应过于激烈，常常伴有黑 The existing middle school chemistry textbook of concentrated sulfuric acid oxidation experiments have the following questions: 1. Test tube mouth open, resulting in irritating smell of sulfur dioxide escape to the air to make teachers and students more than cough, and cause environmental pollution. 2. Substance test strips of sulfur dioxide, the effect of wood obvious, not easy to see the back row of students. 3. Heating copper wire and concentrated sulfuric acid mixture, the reaction is too intense, often accompanied by black