I’ll take any excuse to conduct a science experiment with kids! Valentine’s Day, Fourth of July, Christmas, Easter, the season doesn’t really matter. It’s always a good time to make chemical reactions. Since it’s Valentine season, this fizzy heart experiment is a wonderful way to celebrate. The Fizzy Hearts Baking Soda and Vinegar Experiment for Kids is easy and exciting!

– Life Over C's Frozen Baking soda and vinegar heart valentine's day science experiment for kids

Recommended Grade Level:

Materials for the Frozen Hearts Valentine’s Day Science Experiment

  • Baking Soda
  • Vinegar
  • Water
  • Heart Silicone Molds
  • Pipette
  • Red Food Coloring

Frozen Baking Soda and Vinegar Experiment:

Valentine’s Day Science Experiments


Simple science activities for kids engage them in scientific inquiry before they realize how important it is! For kids, a frozen baking soda experiment is a fun opportunity to make a little mess!

Teachers and parents know the real value behind all of this experimentation, but don’t worry, we don’t have to tell.

I like to demonstrate experiments first for the whole class. Then, I prepare enough materials to break the class into small groups to try it themselves.

– Life Over C's Red baking soda mixture in silicone heart molds.

Depending on the age of your students, you might want to round up a few adults to work with each small group.

I also find it helpful to assign group members a role, so that everyone gets to participate in some way.

This frozen baking soda and vinegar experiment requires two separate sessions to allow time for the hearts to freeze.

While you’re waiting, you might make predictions on what happens when you mix vinegar and baking soda.

After the results are in, here is the science behind this baking soda and vinegar science experiment:

  • Vinegar contains acetic acid and hydrogen ions
  • Baking soda contains sodium and bicarbonate ions
  • When the two are mixed together, they create carbonic acid
  • The carbonic acid then begins to decompose into carbon dioxide, which rises and creates the bubbles/fizz
– Life Over C's Fizzy heart science experiment for Valentine's Day

Why Is It Important For Kids To Do Simple Science Experiments?

Besides the fact that kids are naturally curious, there are lots of other benefits they’ll reap by exploring mixtures, reactions, and more. This baking soda and vinegar experiment is easy to do, which means that rather than focusing on preparation and process, they can focus on observation and experimentation. Which creates a much more laid-back atmosphere for working on other skills.

Background Knowledge

Previous experiences, language, and vocabulary related to science provide valuable background knowledge. As children grow and delve into different science concepts, their early experiments give them a firm foundation to build upon.

Fine Motor Skills

Experiments often require pouring, dipping, squirting, and other movements that require fine motor control. I can’t think of a more fun way to exercise those muscles!

Hand-eye Coordination

Those same movements that require fine motor control also improve hand-eye coordination.

Language Development

Giving children a wide variety of experiences from a young age helps them understand the world. As they learn and talk about science, language and vocabulary skills are greatly enhanced.

Materials needed for the Fizzy Hearts Baking Soda and Vinegar Experiment:

  • ¾ c. baking soda
  • ¼ c. warm water
  • Large mixing cup
  • Red food coloring
  • Vinegar
  • Heart-shape silicone mold (an ice cube tray also works)
  • Shallow bowl
  • Medicine dropper (optional)
– Life Over C's Supplies for making a baking soda and vinegar experiment

How To Conduct The Baking Soda and Vinegar Experiment


Gather all the necessary supplies before beginning the science experiment.

  1. In a large mixing cup, stir together the baking soda and water until the baking soda is dissolved. Stir in red food coloring.
  2. Pour the mixture into the heart-shaped silicone mold and freeze overnight or until completely frozen.
  3. Pour vinegar into the shallow bowl.
  4. Carefully lower the frozen heart into the vinegar.
  5. Observe the reaction!
– Life Over C's Ref food coloring added to baking soda

*If you prefer, you can fill a dropper with vinegar and drip it onto the frozen heart for a more localized reaction.

– Life Over C's Pouring vinegar onto baking soda

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– Life Over C's Valentine's day science frozen baking soda and vinegar experiment for kids
Valentine’s Day Baking Soda Experiment
– Life Over C's I just [heart] these! Valentine Pre-k bundle 35+ pre-k math and literacy activities one easy bundle with arrow pointing to a collage image of the valentine's day activities.

35+ Valentine’s Day Math and Literacy Activities

– Life Over C's valentine's day preschool activities
– Life Over C's Valentine's day theme math and literacy activities for preschool
– Life Over C's Valentine's day math and literacy activities

Included in the Valentine’s Day Math and Literacy Activities:

  • 2 Sets of Valentine Number Mats (empty ten-frame, heart filled ten-frame)
  • Valentine Cards Beginning Sound Match Up
  • 4 Sets of Valentine Clip Cards (color, ten-frame, array, shape)
  • Color Button Sort
  • Class Set of Color BINGO
  • 2 Graphing Dice Games (Matching pictures and Numbers 1-6)
  • 2 Spinner Graphing Games
  • Valentine Theme Line Tracing Cards & Picture Tracing Cards
  • Line-Up Puzzles for Counting to 5 & 10
  • 4 Matching Games (picture, number, alphabet, rhyme)
  • Heart Missing Number Cards
  • 3 Levels of AB Patterns
  • Valentine Play Dough Mats
  • 2 Sets of Counting to 10 Puzzles (array, ten-frame)
  • Valentine Shape Puzzles
  • 2 Roll and Count Mats
  • 2 Sets of Valentine Sorting Activities (shapes and numbers 1-10)
  • 5 Spin & Cover Games (1-5, 6-10, shape, picture)
  • Heart Ten-Frame Cards
  • Valentine Tic-Tac-Toe
  • 4 Sets of Tracing Cards (uppercase, lowercase, number, shape)
  • Visual Discernment Clip Cards (What does not belong?)
  • Trace, Write & Draw the Room

Additional Baking Soda and Vinegar Experiments:

My preschoolers can not get enough of the baking soda and vinegar experiments. So we have done all sorts of variations throughout the years.

Here are a few science experiments that were very loved…

Extend the Activity:

Alter the Mixtures: Create fizzy hearts by freezing vinegar and water. Then, activate by dipping into a baking soda/water mixture.

Play with Amounts: Add more or less of each ingredient, like more baking soda, to compare the reactions.

Create a Challenge: Older students might enjoy a friendly competition. Which group can create the most impressive explosion? How? Why?

Valentine’s Day Printables for Kids

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– Life Over C's Frozen Baking soda and vinegar heart valentine's day science experiment for kids
Frozen Fizzing Hearts Experiment
author avatar
Kim Staten Owner and Curriculum Designer
Kim Staten is a mother of four children ages 20, 19, 16, and 12. Kim has taught at the preschool, kindergarten and early elementary levels for 16 years. With extensive experience working with special needs children, including her own children with special needs (Rett Syndrome, autism, anxiety, and ADHD), she creates hands-on curricula and activities that are great for working with children of all abilities in the classroom and at home. Hands-on, accessible activities are her passion. 

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