We love a good baking soda experiment. I spotted this brilliant and very simple idea on Reading Confetti, who kindly said I could post about it here. These are our fizzing rocks.
What you need:
Bicarbonate of soda/baking soda
Mix some water with the bicarbonate of soda, I used a whole packet of bicarbonate of soda and just added water slowly until i had a very thick paste type mixture.
Add a few drops of food colouring, mould into rock shapes and leave to dry for a few hours.
Once the rocks have hardened, add vinegar very slowly and watch as they fizz and dissolve.
The Science bit
Vinegar (an acid ) and bicarbonate of soda ( an alkali ) react together to neutralise each other. This reaction releases carbon dioxide a gas which is the bubbles you see.
Add small objects to the rocks and drop them into a bowl of vinegar like Reading Confetti did.
Make one big rock and see how much vinegar is needed to totally dissolve it.
We also have a Valentine version of this. Can you think of any other ideas?
Make sure you check out some of our other fun science for kids posts.
Last Updated on January 25, 2016 by Emma Vanstone