Lemon Volcano

A fun, fizzy, foaming, fantastic eruption made by reacting Bi-Carb with lemon juice inside a lemon.

What You Need:

  • Bi-Carb Soda

  • Food Colouring

  • Lemon

  • Dish Washing Liquid (optional)

  • Lemon Juice

  • Paddle-pop Stick

What You Do:

  1. Slice the bottom off the lemon so that it can stand upright by itself and carve a small hole in top of the lemon.

  2. Use the Paddlepop stick to mash the insides of the lemon so that the hole fills with juice. Be careful not to poke the stick through the bottom of the lemon.

  3. Add in a drop of food colouring, some dishwashing liquid (optional, but makes the eruption more foamy) and finally the Bi-Carb Soda.

  4. Mix together and watch the eruption.

  5. Alternate adding extra lemon juice and Bi-carb to keep the eruption going. You can also add in different coloured food colouring.

How It Works:

The juice of the lemon contains citric acid which when mixed with the Bi-carb soda reacts to form carbon dioxide and sodium citrate, which causes the liquid to fizz and bubble.

What Next?

You can try using other citrus fruits (orange, mandarin, grapefruit) to make different "volcanos". Or you might like to try making your own fizzy soft drink by adding Bi-Carb to some homemade lemonade.