Two liquids mix together and start to emit a blue light
name: Chemiluminescence because of oxidation of luminol by hydrogen peroxide
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Avoid contact of hydrogen peroxide with skin.
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In the reaction of luminol oxidation blue light is emitted. This reaction is catalyzed by copper (II) ions and the emission of light increases in presence of these ions. Ferrocyanide ions may also be used for this purpose.
Why does the solution in the flask start glowing?
Luminol is an unusual substance.
Under certain impact conditions, it can donate electrons to other substances – in other words, become oxidized. The process is accompanied by the glow, which can be seen in the dark with the naked eye. This oxidation can only happen if luminol solution includes a certain set of reagents. At the moment when K3[Fe(CN)6] is added to the solution along with the other required components, all the conditions are met for the reaction, and we see a beautiful blue glow.
Now let's examine the roles of each reactant and see how the reaction proceeds. There are four reactants total: luminol itself, red prussiate of potash K3[Fe(CN)6], hydrogen peroxide H2O2, and sodium carbonate Na2CO3.