Baking Soda & Citrus Fizzy Geo-Eruptions

30 mins Ages 4-6 Indoor

A playful, screen-free adventure designed to spark curiosity, sensory exploration, and fine motor skills for kids aged 4 to 6.

Materials Needed

  • • Fresh lemons (2 units)
  • • Baking soda (3 tablespoons)
  • • Dish soap (1 squirt)
  • • Food coloring (2 colors)
  • • Wooden craft sticks (2 units)

Pro Tips

  • → Cut the bottoms off the lemons so they sit flat like volcanic vents inside the tray.
  • → Let your child poke and mush the lemon flesh inside with a craft stick to release citric juices before adding powder.
  • → Touch the bottom of the lemon during the reaction to feel the endothermic cooling effect.

Safety First

Keep citrus juice away from eyes. Wash hands thoroughly after experiment.

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Step-by-Step Instructions

1

Step 1

Slice the bottom off two lemons so they stand upright, then core out the top centers to make two hollow wells.

2

Step 2

Place the lemons in a rimmed tray and let child mash the inside pulp with a craft stick to release juice.

3

Step 3

Add 1 drop of liquid dish soap and 3 drops of food coloring directly into each lemon crater.

4

Step 4

Spoon 1 tablespoon of baking soda into the lemon crater, stir vigorously with the stick, and watch thick foam erupt.

What they are learning

Citric acid-base endothermic reaction Carbon dioxide gas release Sensory olfactory engagement