When you think of great science experiments for kids one of the first that springs to mind is probably a baking soda volcano eruption. I remember making one with my little brother in the kitchen when he was about 4 or 5. Volcanoes and coke floats were our favourite summer activities when I baby sat!
A volcano eruption is a fantastic first demonstration of a chemical reaction as the ingredients are safe ( although do wear safety glasses to protect your eyes from vinegar )
Why does a baking soda and vinegar reaction happen?
If you combine an acid and an alkali they react together to neutralise each other. Vinegar is an acid and bicarbonate of soda is an alkali.
The reaction releases carbon dioxide gas, which is the bubbles you see. If you add washing up liquid ( dish soap ), to your eruption mix the bubbles make the washing up liquid bubble up, giving the appearance of lava erupting from a volcano.
How to make a baking soda volcano
Basically you need the ingredients for the eruption, a jar or small bottle for the eruption to happen in and something to use as the volcano part.
Volcano – sand, snow, modroc etc
Small jar or bottle
Red food colouring
I don’t usually measure an exact amount of each, but a good dollop of baking soda, a squirt of dish soap and a bit of red food colouring mixed with a little water should give you a good eruption. If it doesn’t, add a bit more baking soda.
Read these easy instructions for making a baking soda volcano and you should be good to go!
What happens if you don’t use the dish soap? Can you predict what might happen before trying it?
What happens if you add extra dish soap?
Can you think of an acidic fruit you could use to make an eruption without adding vinegar?
Can you make a multicoloured volcano? We split our jar in half and poured yellow food colouring into one half and red into the other for this.
What’s your favourite volcano to make?
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