This Lego Volcano Science Experiment is so fun and easy to add to your summer to-do list. It’s the perfect example of a baking soda and vinegar reaction test for Lego lovers. Just grab all your random Legos, some baking soda and vinegar, and you’ve got yourself a nice little science experiment.
Start with a flat Lego base, if you have one. If you don’t have a Lego base, you can just start building the volcano by making a large square and then build upwards. If you plan on doing the science experiment indoors, I highly suggest using an activity bin or something with a lip to prevent a huge mess.
Related: Foaming Orange Volcano
As you’re building your volcano, talk with your little ones about what they think will happen when you mix baking soda and vinegar together. Ask them to make a hypothesis about what the reaction will be. If your kids are a little older and can write, add an extra step to this science experiment by getting out some paper and asking your kids to draw a picture of their volcano before and after adding the baking soda and vinegar. On the same paper they can also write down their hypothesis.
Related: Floating Letters Science Experiment
Just before topping off the Lego volcano, add a few scoops of baking soda. Then finish off the top but leave a small opening to pour in the vinegar. For a little extra fun, pour some vinegar in glass and add some food coloring. When you’re ready, count down and pour in the vinegar and watch what happens!
- Lego Building Base
- 4 tbsp. Baking Soda
- 1 cup of Vinegar
- Food Coloring (optional)
- Activity Tray (optional)
- Build Lego volcano.
- Before completely finishing the top of the volcano, add 4 tbsp. of baking soda to the inside. Finish off the top of the volcano until there’s a small opening. Note: you can really add just as mush baking soda as you want, there’s no limit.
- Add vinegar to see reaction.
What are some of your favorite baking soda and vinegar science experiments? If you like this Lego Volcano Science Experiment, please pin.
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Hi! I’m Meagan I just turned 40! I’ve been married for 14 years. I’m a proud boy mom, happily navigating my way through the little boy years. I met my husband over 20 years ago in high school; we got married 10 years later after graduating from the University of South Florida. I currently help run a family business with my parents while blogging about my life and love of DIY projects!
When I’m not at a kids sports game, I enjoy spending time with my family on a beach anywhere. I also love decorating and organizing, fun DIY projects, bargain shopping, and eating out or in! I also love Barbecue anything and a good show or movie on Netflix.