Science Rocks

Lemon Volcano

Ideal for Preschool/Pre-K, School-Age

Drawing of scientific beakers.

This activity promotes development and learning by encouraging children to:

  • Observe the chemical reaction of citrus acid and baking soda
  • Make a hypothesis, test, and run an experiment

Materials Needed:

  • One lemon
  • Baking soda
  • Food coloring
  • Tray or bowl
  • Knife (with adult supervision)
  • Spoon


  1. Use a knife to cut off edges of the lemon and then cut lemon in half
  2. Place lemon halves in your bowl or tray
  3. Poke the lemon with a knife and then cutout the inside, leaving it in the rind
  4. Drop food coloring onto top of lemon
  5. Pour baking soda on top of the lemon
  6. Observe what happens next!

Extension: Try using other citrus fruits

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