Experiment
Bath bomb
You need:
- Water
- 5 bags of baking soda (each 50 grams)
- 5 bags of citric acid (each 25 grams)
- Plastic foil
If you want to make it extra delicious, you also need:
- Food coloring
- Fragrance oil
This is what you do:
Put half a teaspoon of water in a bowl together with baking soda and mix well.
Mix in a few drops of fragrance oil if you want it to smell delicious!
Put in citric acid and knead everything together into a coarse-grained mass.
Squeeze the mixture into balls the size of half an egg.
Wrap them tightly in plastic wrap and tie the opening.
After a few hours, the balls solidify and become hard.
Observe:
Use your senses to observe the experiment.
- What do you see?
- What's up?
- Can you hear anything?
- How long do the reactions last?
Record your observations.
You can play further with the experiment by dropping one bath bomb in cold water and one in hot water.
Which one reacts the fastest? Record your observations.
What is going on?
Baking soda is a base and citric acid an acid. When you unwrap the bath bomb and drop it into the bath water, the baking soda and citric acid begin to react. This reaction forms carbon dioxide gas. This makes it look like the bath bomb is fizzing and you get a small underwater explosion!
