Phụ lục 2 phản ứng hóa học dao động Có một loạt các phản ứng hóa học đáng tin cậy dao động được mô tả trong các tài liệu hóa học, bao gồm cả công thức nấu ăn nhiều có thể truy cập trong cuốn sách dành cho giảng dạy, một độc giả nói chung. Nghe Đọc ngữ âm Xếp hạng bản dịch | Page 27 Appendix 2 Oscillating Chemical Reactions There is a variety of reliable oscillatory chemical reactions described in the chemistry literature including many accessible recipes in books intended for teaching or for a general readership. One of the most striking in terms of the colour change is the iodate iodine peroxide oscillator . The recipe that I have tested for myself is as follows Solution A 200 ml of potassium iodate KIO3 solutionmade by adding g KIO3 and 80 ml of 2M sulphuric acid to distilled water to make a total volume of 1 litre. Solution B 200 ml of malonic acid manganese sulphate MnSO4 solutionmade by adding g malonic acid and g MnSO4 to distilled water to a total of 1 litre. Solution C 40 ml of 1 starch solutionmade by adding a slurry of soluble starch to boiling water. Solution D 200 ml of 100 vol. about 30 hydrogen peroxide H2O2 solution. Mix solutions A B and C together in a conical flask and then initiate the reaction by adding solution D. Mix well using a magnetic stirrer. After a minute or two the solution which is initially blue owing to the formation of iodine which reacts with starch to form a blue compound turns a pale yellow as the iodine intermediate disappears and then abruptly blue again to begin another cycle. The colour changes persist for about 15-20 min but finally run out of steam because some of the initial reagents are consumed in each cycle and not replenished. After a few minutes the mixture begins to bubble as carbon dioxide gas is generated from the oxidation of malonic acid. If the mixture is not stirred the colour changes still take place but grow from filamentary patches throughout the solution. It is important that the malonic acid solution is not prepared too far in advanceit begins to decompose over the course of several weeks. The most famous oscillatory reaction is the Belousov-Zhabotinsky reaction for which various recipes are available in the literature. Here s one that I have seen work .
