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Fizzy Heart Science Experiment

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The kids are certain to love this Fizzy Heart Science Experiment! It’s a great way to get them excited and engaged in the learning process!

The simplest science experiments are often the most fun, the ones you keep coming back to time after time. Especially if you have preschoolers looking for a messy busy activity. One of our most popular go-to activities is simply vinegar and baking soda..as a base. Even my 4th grader still enjoys these activities.

There are so many variations on what you can do with it, add a little food coloring, a few props and science items and you can create an experiment that lends itself well to any theme. Like this, Fizzy Heart Science Experiment – what a fun way to include a little Valentine’s fun in their day today.  Don’t forget to check out other Fizzy Experiments Your Kids Will Love.

Fizzy Heart Science Experiment

Fizzy Heart Science Experiment

Anytime I tell the kids that they get to have their hands get a tad bit messy, they’re on board 100% for any type of learning activity fun. And while this fizzy STEM activity is fun, they love that it’s a Valentine’s Day themed activity as well.

I’ve found that over the course of my teaching the kids at home, they really respond well to themed activities and themed learning packets. It just helps them find a tad bit more excitement in gearing up for learning for the day.

Using this science activity is such great motivation!

Recommended Valentine’s Day Books

Don’t forget to pair up all your learning activities with some great books as well. Since this STEM activity for kids is heart-themed, it just makes sense to have some Valentine’s Day reading also.

Below you’ll find some of our favorite reads for this time of the year but feel free to add in your own as well.

 Happy Valentine’s Day, Mouse! (If You Give…) The Night Before Valentine’s Day Day It Rained Hearts Love Is My Favorite Thing

Fizzy Heart Supplies

Gather up the list of simple supplies to get started on this fun activity!

 Wilton 2304-115 Nesting Heart Cutter Set Ann Clark Cookie Cutters 4-Piece Heart Cookie Cutter Set with Recipe Booklet, 2.6 120 Pcs Fireboomoon Clear White Plastic 6.1 McCormick Red Food Color, 0.25 Fl. Oz (4 Count)

Fizzy Hearts Instructions

Determine how many hearts you want to make, this experiment is pretty fun and the kids will beg for more so mix up a good-sized batch!

In a large bowl place your baking soda and slowly add water, mixing with a spoon first and then your hands to get it well mixed. You want it just a bit wet but still firm, like a gritty toothpaste.

fizzy stem experiment

To make it themed for Valentine’s day add some red food coloring and glitter for good measure.

If you are using cookie cutters place them on a baking sheet or another pan.

Press your mixture firmly into each cookie cutter to fill.

Valentine's Day heart experiment

Place in the freezer for a couple hours.

Remove the hearts from the freezer

Provide your child with a bowl or cup of vinegar and droppers or syringes to use on their frozen baking soda heart.

fizzy heart stem experiment

The fun is in watching how the two react together to change texture and shape.

fizzy stem experiment

As they slowly add vinegar this experiment will last a little while but I promise you they will beg for more so I would have a couple hearts on hand!

They’re going to love the fizzy outcome and you’re probably going to be making this activity over and over again!

More Valentine’s Day Activities

Valentine’s Day Treasure Dig

Valentine’s Day Letter Puzzles


  1. Oh my goodness this looks like a blast. I definitely want to try this with my Kindergarten class. Thank you.

  2. My students this year Love Live vinegar and baking soda reactions. Thanks for sharing this Valentine’s Day activity!

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