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Iodine Clock Reaction
A solution of hydrogen peroxide and sulfuric acid is added to a solution of iodide ion, thiosulfate ion, and starch. A slow reaction forms triiodide, which reacts rapidly with thiosulfate, until the thiosulfate is consumed. The excess triiodide then reacts with the starch to form a blue complex.
The size of the movie file is 1.6 MB and its duration is 24 seconds. The name of the movie file is "CLOCK1.MOV" and it is located in the folder "MOVIES/CLOCKRX".If your browser has not brought the movie into the above space (you might be running a version of Netscape earlier than 3.0 or not have the proper plug-in), clicking on the following will possibly access the movie. Play movie.
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