Super Cold Bag

Here's a great experiment we did - one you can try at home!

Super Cold Bag

You Need:

·  Citric Acid

·  Baking Soda

·  Tap Water

·  Zip lock bag (15cm x 10cm)

·  Measuring cup

·  Plastic spoons

·  Teaspoon

What to do:

1.  Put one level teaspoon of citric acid in a zip lock bag.

2.  Put one teaspoon of baking soda in the same zip lock bag. And shake the bag gently to mix the two chemicals.

3.  Fill up the measuring cup with cold tap water (about 30ml).

4.  Carefully seal up the bag without tipping ove r the cup of water inside it. Then tip the cup over 

Not only does the bag blow up, it also becomes super cold! So don’t forget to feel its temperature. (We measured that the bag went from 28*C to 15*C!!)

Why is it so?

Mixing citric acid, baking soda and water together causes a chemical reaction. The new chemical that is made is carbon dioxide gas. This gas fills the bag and causes it to blow up. You’ll also notice the bag drops in temperature as part of the chemical reaction.