This is a fantastically dramatic science experiment to try at home.
We’ve created instructions to help you build your own papier-mâché volcano which looks great but does take some time. You may choose to jump straight ahead to the chemical reaction!
To make the volcano you will need:
- An empty cup, jar or small bottle
- An easily cleanable tray
- Sticky tape
- Newspaper or scrap paper
- PVA glue
Construct the papier-mâché volcano
1. Place your cup in the middle of the tray and use sticky tape to attach it firmly.
2. Scrunch small pieces of paper into balls and arrange them around the cup to make the basic shape of a volcano. Use loops of sticky tape to attach the balls to the cup and each other.
3. Tear strips of paper and lay them over the volcano shape, using generous amounts of PVA glue to stick them down. Work methodically to cover the whole structure, overlapping the strips of paper.
4. Leave the volcano to dry.
5. Paint the volcano according to your own design. You may need to do a couple of layers of paint, leaving time for it to dry in between.
To create the chemical reaction you will need:
- 50ml vinegar
- 1 tbsp washing up liquid
- 2 tbsp water
- Red food colouring (optional)
- 1 tbsp bicarbonate of soda
Prepare the chemical reaction
1. Mix the vinegar, washing up liquid, water and red food colouring (if you’re using it) in a jug.
2. Place the bicarbonate of soda in the bottom of the cup at the centre of your volcano and ensure you're working in a well ventilated room, or even better outside!
3. Pour the vinegar mix into the cup, stand back and watch what happens!
What is happening as the volcano erupts?
Bicarbonate of soda is an alkaline, whilst vinegar is an acid. When the two combine a chemical reaction occurs which produces carbon dioxide gas.
This gas then gathers around the washing up liquid creating even bigger bubbles. As this happens pressure builds within the cup until the “lava” overflows the top, just like a real volcano!