SO2 气体的制备和性质实验1.doc

SO2 气体的制备和性质实验 ----微型化学实验设计 09化学师范班 骆梦振 0913010064 组员：09化学师范班 李燕兴0913010056 【引言】：二氧化硫是中学化学中一种常见的氧化物，其性质既复杂又重要。1．实验装置繁琐，耗时较长；2．气密性难以保证，易造成污染；3．药品用量太多。为了解决原教材实验中实验现象不明显的问题且符合绿色化学的理念，对二氧化硫性质实验进行了改进使本实验具有药品用量少、污染少、省时、经济、便于操作等优点 introduction 】 : sulfur dioxide middle school chemistry is a kind of common oxide, its nature is complex and important. Sulfur dioxide is a toxic colorless stimulating odour of gas, in the classroom teaching of preparing and nature of the sulfur dioxide experiment, a big part of it would cause gas to escape, indoor environment pollution, teachers and students health effects. Sulfur dioxide and properties of preparing (soluble in water shows acid, oxidizing, reducing bleaching and self) experiment content more, such as experiment to separate will include a inconvenience, so many teachers will be designed in the combination experiment. But the combination experiment also has its own problems: 1. The experiment device tedious, time-consuming longer; 2. Hard to ensure air tightness, easy cause pollution; 3. Drug dosage too much. In order to solve the original teaching material in the experimental phenomena is not obvious problems and comply with the concept of green chemistry, sulfur dioxide and nature is to improve the experiment, the experimental drug consumption and pollution is less, saving time, economic, easy operation, etc. 【关键词】：?微型实验?Keywords】: Miniature experiment sulfur dioxide; Nature; The experiment improvement; Green chemistry 【实验主体】 一、实验药品与仪器 1.药品：浓硫酸、亚硫酸钠固体、蓝色石蕊试纸、高锰酸钾溶液、品红溶液、硫化钠溶液、2.仪器：铁架台、漏斗、带胶塞的试管、二．实验装置： 三.实验步骤： (1)准备好所用的仪器并洗干净，按上图安装好仪器，检验仪器的气密性，向试管内加人少量的亚硫酸钠晶体。 (2)在长颈漏斗的下端玻璃管外壁从上到下依次粘牢蓝色石蕊试纸环a一个，滤纸环三个。试纸环用蒸馏水湿润，三个滤纸环依次用品红溶液b、酸性高锰酸钾溶液c、硫化钠溶液d湿润。 (3) 沿着长颈漏斗向试管中加人适量的浓硫酸，观察各滤纸纸环的颜色变化。一段时间后可以看到蓝色石蕊试纸变红、品红褪色、高锰酸钾溶液褪色、附有硫化钠溶渡的滤纸上有少量淡黄色物质出现。 四、实验现象与结论 1.品红溶液颜色褪去，说明二氧化硫具有漂白性，重新加热，溶液又变红，说明二氧化硫的漂白性不稳定。 2.蓝色石蕊试纸变红,说明2的水溶液呈酸性。 3.滴有KMnO溶液滤纸褪色，说明2具有还原性，易被KMnO所氧化。 4.滴有Na2S溶液滤纸变为黄色，说明2具有氧化性，能将-2价的硫氧化为0价。 1.原实验中，二氧化硫漂白实验实