Classic Iodine Clock Demonstration
Автор: Azman Abas
Загружено: 2020-06-10
Просмотров: 84
Описание:
The iodine clock reaction is a classical chemical clock demonstration experiment to display chemical kinetics in action.
The iodine clock reaction exists in several variations, which each involve iodine species (iodide ion, free iodine, or iodate ion) and redox reagents in the presence of starch. Two colourless solutions are mixed and at first there is no visible reaction. After a short time delay, the liquid suddenly turns to a shade of dark blue due to the formation of a triiodide-starch complex. In some variations, the solution will repeatedly cycle from colorless to blue and back to colorless, until the reagents are depleted.
In this demonstration, the mixture of potassium iodide solution, starch solution (to indicate the presence of iodine) and sodium thiosulphate solution were heated at different temperature before mixed with hydrogen peroxide and sulphuric acid. The time taken for the solution turns dark blue varied with the temperature of the solution.
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