Oscillating Reactions: Briggs-Rauscher

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Lauren Kelley
Chemistry Blog
2/27/19

Oscillating Reactions: Briggs-Rauscher


In experiments, color is a great indicator that a reaction has happened. Some interesting experiments can create the color to change several times. This is what I chose to dig further in and maybe could be used as my do-it-yourself experiment! This reaction is called the Briggs-Rauscher reaction, or also the oscillating clock. The color change starts with three colorless solutions and combine to create amber and a deep blue throughout about three to five minutes.
Oscillating reactions are often called “chemical magic”. The reactions are fascinating because they are continuous or have multiple indicators in a single trial. These kinds of reactions are rare which is what makes the Briggs-Rauscher reaction so special. They defy common sense because chemical reactions usually go only in one direction. The Briggs- Rauscher takes this one step further because after it changes color it goes back to a colorless solution.
Why does it happen? This is the formula.
IO3- + 2 H2O2 + CH2(CO2H)2 + H+ --> ICH(CO2H)2 + 2 O2 + 3 H2O
Although it seems complicated, it is quite easy when you break it down. Just by looking at that sequence you can identify a reactor as water and a product as oxygen. Some of the others include hydrogen peroxide, hypoiodous acid, iodate and potassium iodate. Also, there is one reaction/formula listed above, since there is more than one color change there are more formulas including;
IO3- + 2 H2O2 + H+ --> HOI + 2 O2 + 2 H2O
HOI + CH2(CO2H)2 --> ICH(CO2H)2 + H2O
I- + HOI + H+ --> I2 + H2O
I2CH2(CO2H)2 --> ICH2(CO2H)2 + H+ + I-

Oscillating reactions continue to fascinate our generation of not only children but scientists too! It is important to continue looking and studying at reactions that seem to be continuous to learn more about different solutions or substances. Going forward, we scientists can continue to experiment and be mesmerized by these enchanting experiments.
 

Sources: https://www.thoughtco.com/briggs-rauscher-oscillating-color-change-reaction-602057
http://inside.mines.edu/~dwu/classes/CH353/labs/ClockCKS/Wet%20Lab%204/Oscillating%20Reactions.pdf
https://projects.ncsu.edu/project/chemistrydemos/Kinetics/BriggsRauscher.pdf
https://www.thoughtco.com/briggs-rauscher-oscillating-color-change-reaction-602057

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