Chem Lab Help: Briggs Rauscher Reaction

Chemistry
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In Part A, the reaction oscillates between two different colors. Using information and observations from Part B, propose a chemical species responsible for each color. 

Oct 3rd, 2015

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The Briggs-Rauscher oscillating reaction was published in the 1970's [2] by including Iodate and hydrogen peroxide to the BZ reaction  [1]. The BZ reaction, the Belousov–Zhabotinsky reaction , is an oscillating reaction that had been previously discovered in Russia. According to Wikipedia [1], the initial Briggs-Rauscher reaction contains hydrogen peroxide, and iodate, a catalyst, a strong nonreactive acid, a carbon compound to reduce free iodine to iodide, and starch. Starch is an indicator that shows the increase in iodine in the reaction. The color of the solution changes from amber (free iodine) to dark blue (iodine-starch complex), and keeps oscillating. It is adequate for educational demonstrations.

References:

[1] Briggs-Rauscher reaction. In Wikipedia. Retrieved in October, 2015, from http://en.wikipedia.org/wiki/Briggs-Rauscher-reaction

[2] Briggs, T, and Rauscher, W (1973), "An Oscillating Iodine Clock", J. Chem. Educ. 50, 496.

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Oct 3rd, 2015

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Oct 3rd, 2015

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