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Saturday, November 19, 2011

Explosive lunch bag

Saco bomba! Explosão dentro de um saco plástico
Explosions are most of the time messy. Usually it's dangerous, but what Restless Minds bring you today is a nice, cool and harmless prank. 

This demonstration uses the same reaction we saw here, with the volcano, and here, with the balloon.
In this reaction acetic acid reacts with sodium bicarbonate, the product of that reaction is carbon dioxide and water. 

What we need:
    Saco bomba! Explosão dentro de um saco plástico
  • zip lock plastic bag,
  • paper napkins,
  • 2 tablespoons of baking soda, sodium bicarbonate,
  • 1/2 cup of vinegar, without any flavors,
  • 1/4 cup of warm water.

How to:
  1. First of all, do not do this at home, do it outside in a place you can clean easily.
  2. Make sure bag has no holes, fill it with water the easiest way,
  3. Empty the bag,
  4. Dry it,
  5. Place the baking soda on the napkin,
  6. Fold it like an envelope,
  7. Inside the zip lock bag place the vinegar and the warm water;
  8. Saco bomba! Explosão dentro de um saco plásticoQuickly but carefully  place the "envelope" inside;
  9. Close the zip;
  10. Place the bag on the floor and step back, again quickly but carefully;
What happen?
The bag will swell and open with a BANG!

As we saw here and here, acetic acid (vinegar) reacts with sodium bicarbonate (baking soda) and neutralizes it.
This reaction is very fast and results in the production of CO2- a gas. This gas fill the balloon raising the pressure inside, when the pressure is unsustainable the bag open with a loud BANG!

Chemical reaction:
Reacção química vinagre bicarbonato dioxido de carbono
from here

Et Voilá!


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