The Briggs-Rauscher Iodine oscillator

This reaction is an extremely interesting reaction that is a rare phenomenon in chemistry – an oscillating reaction. Three clear solutions are combined, and the color gradually changes to amber. Suddenly, the whole thing goes dark blue! This remains for a bit, then fades back into amber and the whole cycle repeats.

The full reaction mixture is a stew of many different chemicals:
Solution A:
0.2M KIO3
0.77M H2SO4

Solution B:
0.15M malonic acid
0.02M MnSO4
Starch (very tiny amount, since it is only slightly soluble)

Solution C:
4.0M H2O2

The three are combined together in equal amounts. There are as many as 30 different reactions happening simultaneously during the reaction. The paper I mention that talks about this in great detail is titled “The Oscillatory Briggs-Rauscher Reaction. 3. A Skeleton Mechanism for Oscillations” by Noyes and Furrow. I found it online someplace, but can’t seem to locate it again for free.

Anyways I hope my explanation was helpful! It took me a while to get a good grasp of it myself. As always, thanks for watching and if you have any questions please let me know.

Found @ MrHomeScientist’s video channel.

@ haha.nu

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