Resumen de A Kinetics Demonstration Involving a Green-Red-Green Color Change Resulting from a Large-Amplitude pH Oscillation
Brian W. Pfennig, Richard T. Roberts
A chemical demonstration of a clock reaction involving red and green colors for the winter holiday season is reported. The system consists of oxidation–reduction reactions involving iodate, sulfite, and thiosulfate that experiences a large-amplitude spike in pH. A combination of suitable acid–base indicators is employed to effect the green–red–green color changes as the pH changes. The spike behavior can be monitored as a function of time using a pH meter. The pedagogical relevance of the demonstration is also discussed.
