Fizzy Frozen Heart Baking Soda Experiment - Valentines Day Science!

These Fizzy Frozen Hearts are pure fizzling fun, not to mention the perfect Valentines Day science project! Celebrate Valentine's Day with your kids by putting this baking soda experiment to the test.

Fizzy frozen hearts science project


We are so excited to share these awesome fizzing hearts with you today. After seeing our little ones' reactions when we did it at home, we're most certainly sure your kids will love it just as much.

This Valentine's Day science project is a match made in heaven. After all, love makes our hearts feel all fluttering and bubbly inside, so fizzy hearts make for a fitting activity!

Although we're taking the day of love as our theme and used the traditional colours of this holiday, you can swap it for any colour you like and test this baking soda experiment any time of the year! 

Beyond the obvious fun kids will have experimenting with these bubbling hearts, this is a marvellous activity to start showing our kids some simple science principles, like chemical reactions. STEM activities are always a good bet, and kids love them, especially if they're hands-on, like this one!

So, get your little one ready for this fun baking soda experiment, and let's get into it!

Valentines Day science

Want to test out more baking soda and vinegar experiments? Check these out: 

Another fun activity to try for Valentine's day is creating hearts using watercolor and salt

Fizzy Heart Baking Soda Experiment - Valentines Day Science

Valentine’s Day Science - Supplies:

  • ¾ cup baking soda
  • ¼ cup warm water
  • Red food colouring
  • Vinegar
  • Heart-shape silicone mould
  • Shallow bowl
  • Pipette 

Baking Soda Experiment - Instructions:

STEP 1: Prepare your home-lab.

Gather all your ingredients and prepare your workstation. This experiment can get a bit messy sometimes, so make sure you're prepared or near the kitchen. 

baking soda experiment supplies

STEP 2: Mix baking soda and water.

Take a mixing cup and measure out the baking soda and water. Mix these ingredients together until the baking soda is completely dissolved.

baking soda and vinegar experiment

Add the red food colouring to the mixture and stir until everything is smoothly blended.

baking soda science project for kids

STEP 3: Make your baking soda hearts.

Take your heart-shaped silicone moulds and carefully fill them with the baking soda and water mixture. Then, put the mould in the freezer until it's completely frozen. We let it freeze overnight, and it worked great!

baking soda science experiment for kids

STEP 4: Time for the baking soda experiment!

Now, the fun part! Take a shallow dish and pour some of the vinegar into the bottom of the dish. Take out the frozen hearts from the freezer and gently place them into the vinegar. Use a pipette to add more vinegar to the top of the frozen baking soda hearts. 

baking soda Valentine's Day science experiment

Valentines Day science for kids

STEP 5: Observe & Discuss.

Whilst having fun with this Valentine's Day science experiment older children can observe what is happening and discuss why the reaction between the vinegar and baking soda might occur.

Baking soda and vinegar reaction

Baking Soda Experiment  - Alternative Experiment Ideas:

With some tweaks, you can use this simple baking soda science experiment and turn it into different ones!

For example, if you make the frozen hearts mixture from water and vinegar instead of water and baking soda, you can then drop the frozen vinegar hearts into a baking soda and water solution to see what happens. 

You can also experiment with ratios and see various results. By mixing different proportions of baking soda and water when you make your frozen hearts, you'll be able to experiment with various interesting chemical reactions.

To up the fun level and take this baking soda experiment to the next level you could even hide some little surprises inside the frozen hearts like little gems, rings or tiny toys. To do this just hide them within the mixture when you make the baking soda hearts in step three. 

baking soda experiment for kids

We hope you'll give this Valentine's Day experiment a try and that you love this baking soda experiment as much as we did! Enjoy the fizzy fun! 

Fizzy frozen hearts Valentine's day science for kids. Baking soda experiment.

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