Colour Change Reaction #experiment #chemicalcompound #chemical #science #sciencechemistry #chemistry

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Colour Change Reaction #experiment #chemicalcompound #chemical #science #sciencechemistry #chemistry

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This is called The iodine clock reaction it is a classical chemical clock demonstration experiment to display chemical kinetics in action; it was discovered by Hans Heinrich Landolt in 1886. The iodine clock reaction exists in several variations, which each involve iodine species (iodide ion, free iodine, or lodate 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.

The color change occurs when 12 reacts with starch to form a dark blue iodine/starch complex.
The purpose of this demonstration is to provide visual evidence of the influence of concentration on the time it takes for a reaction to go to completion.

In some variations, the solution will repeatedly cycle from colorless to blue and back to colorless, until the reagents are depleted.
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RYD date created : 2025-02-09T16:15:10.5020118Z
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