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Fizzy Dinosaur Eggs

If you have a dinosaur fan in your house, then this simple activity will be a huge hit! It’s easy to make and your kids can even help you make the dinosaur eggs!

RELATED: Frozen Dinosaurs

Fizzy Dinosaur Egg Activity


Fizzy Dinosaur Eggs Activity

Kids love doing this easy science experiment. Not only is it a fun activity for a dinosaur fan, but it’s a great learning exercise too. They also get to practice fine motor work by using a pipette or dropper.

To save steps, you can even skip using food coloring and make white dinosaur eggs.

Hatching Dinosaur Eggs

The Science

What happens when you mix vinegar and baking soda?

You see the bubbling and foaming but what is causing this reaction? The baking soda (sodium bicarbonate) is a base while the vinegar (acetic acid) is an acid and what you are seeing is an acid/base reaction. Initially, the reaction makes carbonic acid which is unstable and breaks down into carbon dioxide (CO2) and water which is what creates all of the fizzing and bubbles as the gas leaves the water.


Supplies Needed to Make Fizzy Dinosaur Eggs

– Baking Soda – we like this large 5 lb bag for activities

– Food Coloring Gel (one in each color of the rainbow) – we like to use this liquid food coloring gel since it’s concentrated and makes the colors really vibrant


– Water

– Vinegar

– Small Dinosaur Toys

Dinosaur Egg Activity

Watch the Video Tutorial Here

How to Make Fizzy Dinosaur Eggs

1. Add 1-2 drops of food coloring to 2 tablespoons of water (you can also skip the food coloring to make the eggs white).

Add Food Coloring to Water

2. Add 1/2 cup of baking soda to a bowl. Then add the food colored water to the baking soda and mix.

Note – if you would like to make a larger batch of just one color, mix 1 cup of baking soda with 1/4 cup of water.

Add Water to Baking Soda

Mix until it becomes a crumbly texture you can mold. Repeat for each color you would like to make. If you find the mixture feels too wet to mold, add a little more baking soda in.

Make different color batches


3. Take some of the baking soda mixture and place a mini dinosaur inside.

Add Dinosaur Toys Inside

Add more of the mixture on top of the dinosaur and form into an egg shape.

If the mixture feels too wet to mold into an egg, add more baking soda to it.

Form Dinosaur Eggs

4. Optional – freeze for 15 minutes. The freezing will help keep the eggs together but you can also just add the vinegar right away!

5. Now you can use a dropper with vinegar to watch the dinosaur egg “fizz” away and see the dinosaur inside.

Add Vinegar to Baking Soda Eggs

Kids will love hatching these dinosaur eggs! We matched the dinosaur colors to the eggs but you could also do surprise colored dinosaurs inside if you make white eggs.

More Science Experiments

Try this fun and easy Grow a Rainbow Experiment. You only need washable markers and paper towel!

Growing Rainbow Experiment

For another fun experiment, make some oobleck! 

How to Make Oobleck

Try a rainbow rain cloud in the jar experiment!

Rain Cloud in a Jar Rainbow


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4 comments on “Fizzy Dinosaur Eggs”

  1. Christina P

    If I want to prepare several the day before to use in the classroom, is it ok to freeze them overnight?

  2. My understanding of the directions is that you don’t have to wait for them to dry or harden before letting the kids dissolve them. Am I correct?

    1. The Best Ideas for Kids

      Correct you can use right away. The freezing just helps keep them together so they don’t fall apart.

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