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卤素性质系列实验需用到氯气、氯水,而氯气、氯水的制备是教师及化学实验员感到棘手的问题,主要原因是:①氯气有毒,若实验系统密封不好,会逸散出来,污染空气,伤害身体;②氯气在水中溶解度较小,要制得呈现黄绿色的饱和氯水需较长时间;③氯气利用不充分,多余氯气需用浓氢氧化钠溶液吸收,要增加吸收装置;④各平行班开放药品,拆分清洗费时繁琐,既造成了药品的浪费,又增加了操作者负担。由于以上各方面的原因,部分教师(特别是女教师)往往不愿意、甚至放弃演示与氯气性质有关的实验。为了改变这种状况,让教师高效、安全、方便地做好实验,笔者经反复实践研究,设计制作了氯气和氯水的制、贮、用一体化高效安全装置,较好地克服了这些难题。现介绍如下:
Halogen nature series experiments need to use chlorine gas and chlorine water. The preparation of chlorine gas and chlorine water is a thorny problem for teachers and chemical experimenters. The main reasons are: 1 Chlorine is poisonous. If the experimental system is not sealed well, it will escape. Contaminated air, harm the body; 2 Chlorine gas solubility in water is relatively small, to produce a yellow-green saturated chlorine water takes a long time; 3 Insufficient use of chlorine, excess chlorine need to use concentrated sodium hydroxide solution absorption, to increase the absorption device ;4 Each parallel class opens up the drugs, and it takes a lot of time and effort to separate and clean them, which not only wastes the medicine but also increases the burden on the operator. Due to the above reasons, some teachers (especially female teachers) are often unwilling to give up or even give up demonstrating experiments related to the nature of chlorine. In order to change this situation, teachers were allowed to do experiments efficiently, safely, and conveniently. After repeated practice studies, the authors designed and manufactured an integrated high-efficiency safety device for the production, storage, and use of chlorine and chlorine water, which overcomes these difficulties. . The introduction is as follows: