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Transcript

Glow up

By Nanako and maya

Lorem Ipsum

Why does the solution glow when bleach is added?

Materials

2 Beakers, pippets

0,1g of Luminol and 0,1g of Fluorescein
100 ml of bleach
400 ml of Water
NaOH

Be careful these are chemicals!

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20% Bleach

Solution B

Mix 0.1 g luminol and 10 mL NaOH (to help the luminol dissolve) in 250 H2O.

Solution A

Making the different solutions

Mix 0.1 g fluorescein in 250ml of H2O

Mix 100 mL bleach with 160 mL H2O

Tada!

Result

Turn of the lights and use the pipette to add 10 drops of the 20% bleach solution to each cup. Notice what happens in each case. Then shine UV light on the Solution A notice what changes

You may have noticed that solution A had a blue glow with the addition of bleach and solution B did not glow at all until UV light was held over it.

When bleach is added to a solution containing luminol, an specific reaction occurs, and electrons in the luminol get excited to a higher energy state which in this case is the bleach. As they return to their normal state, they release the energy in the form of a photon. The wavelength of the photon corresponds to the blue light that you see. When all the electrons have returned to their ground state, the mixture should stop glowing. When this effect occurs in a living organism, it is called bioluminescence because it is not chemical but natural. A classic example of this is the light produced by fireflies.
Fluorescein is a fluorescent molecule that absorbs UV light and emits green light. So in order for it to glow it has to be exposed to UV light.

Conclusion

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Thank you!