Science experiments for Valentines Day should most definitely include conversation candy hearts! Do you buy a bag of those candy hearts and then wonder what you’re going to do with them? Why not explore candy science and Valentines Day STEM! Try our dissolving candy hearts science experiment to explore solubility. Valentine’s Day is the perfect time for a simple science experiment with a little candy!


Dissolving candy hearts science experiment for Valentine's Day. Explore solubility and solvents with conversation hearts candy. Fun Valentine's day science with a candy dissolving experiment.


We always manage to wind up with a bag of these hearts for Valentines Day science. Conversation hearts are perfect for conducting simple science experiments with a Valentines Day theme!

How many ways can you use a bag of candy hearts for early learning, fun science, and cool STEM projects. We actually have found quite a few and gathered them for you here, with candy hearts activity ideas!

Dissolving candy hearts is a great lesson in solubility for simple kid’s chemistry! It doesn’t take a whole lot of effort to set up and doesn’t use expensive supplies. You will need to find a place for it the experiment to hang out for awhile while you time how long it takes for the solid to dissolve in the liquid.

We have quite a few fun ways to explore chemistry this Valentine’s Day! There are many playful and engaging ways to show how chemistry works without getting overly technical for very young kids. You can keep the science simple but the fun complex.


Which liquids will you choose to dissolve the candy hearts? Take a look around the kitchen!

More Valentines Day candy Science:

Adding candy to test tubes with different liquid solvents for our dissolving candy hearts science experiment


Exploring solubility is awesome kitchen science. You can raid the pantry for liquids such as water, almond milk, vinegar, oil, rubbing alcohol, juice, and hydrogen peroxide (which we recently used for a very cool thermogenic experiment with yeast).

You can also just choose to use warm, cold, and room temperature water for a simple set-up with your conversation hearts. See more on this below.


Solubility is how well something is able to dissolve in a solvent. What you are trying to dissolve may be a solid, liquid, or a gas and the solvent could also be a solid, liquid, or a gas. So testing solubility is not limited to testing a solid in a liquid solvent! But, that’s what we are doing here with our dissolving candy hearts

This experiment asks the question of which liquid is a better solvent for dissolving the solid, a candy heart. There are a few different ways this experiment can be set up for kids at home and in the classroom. See how we set up a “what dissolves in water experiment” here.

Testing the solvency of different liquids with candy hearts. Explore the solubility of conversation candy hearts


There are tons of great ways to use these hearts to explore science and STEM, so don’t worry about the big bag going to waste. Check out more ideas here to use them up here with more candy hearts activities and print out our Valentine’s Day STEM cards too!



  • Test Tubes and Rack (alternatively you can use clear cups or jars) I really like this little kit I purchased. It comes with a few simple science activities but you also have a great rack and test tubes to use for other projects!
  • Conversation Candy Hearts
  • Variety of Liquids (cooking oil, vinegar, water, milk, juice, rubbing alcohol, or hydrogen peroxide)
  • Timer
  • Stirrers (optional)
  • Printable Dissolving Candy Hearts Science Worksheet 

Test tube science activity with candy hearts for Valentines Day science


Here are a few ways to set up this dissolving candy hearts science experiment depending on how much time you have and what age group you are working with. Even a water sensory bin with a handful of these candy hearts makes a playful and taste safe sensory science option for your littlest scientist!

FIRST SET UP OPTION: Use just water to show how a candy heart dissolves. Will water dissolve the hearts. Learn about why water dissolves sugar.

SECOND SET-UP OPTION: Use different temperature water. Ask the question, will a hotter or colder water dissolve the heart faster?

THIRD SET UP OPTION: Use a variety of liquids to test which liquid is a better solvent. A few good liquids to include are vinegar, oil, and rubbing alcohol.


  • You will start by adding an equal amount of the chosen liquids to each test tube or cup! Have the kids help with measuring too!
  • This is a great time to discuss what they think will happen to each candy heart in each liquid and make their own predictions and write or discuss a hypothesis. The scientific method can easily be adapted for younger kids.
  • Once you have discussed each liquid. you can go ahead and add a candy heart to each liquid.

Candy hearts science activity


Let’s add another component to the activity and grab a timer.

How will you determine the end of your candy heart science experiment? Will you set a time limit or observe it over the course of a morning, afternoon, or day.

Can you pinpoint using the timer which liquid will dissolve the candy heart the fastest,

Set the timer. Wait, watch, and observe changes in the candy hearts.


Dissolving candy hearts STEM activity for kids Valentines Day science

Don’t expect a fast process. You will see changes start to take place but our time was still going two hours later.

While you are waiting, why not stack candy hearts for a quick Valentine’s Day STEM challenge. We have some fun printable challenge cards this year.

Stacking candy hearts

Make sure to check in on your dissolving candy hearts experiment every now and then. Your kids probably aren’t going to want to sit and stare at it for a couple hours unless they really love stacking the candy.

You can also make our candy heart oobleck to check out solubility playfully.

Examining dissolving candy hearts. Water is the universal solvent!


This candy science experiment is also a great way to introduce STEM to young kids! What is STEM? STEM is science, technology, engineering, and math. If you take a look around, STEM is everywhere. A good STEM activity features two or more of the key pillars. This science project includes both math and science!

Dissolving candy hearts in oil solvent science experiment


I would like to point out what the heart says that is in the oil above. NO WAY. Funny, as the candy will not really dissolve in cooking oil. Why? Because oil molecules are much different than water molecules. They do not attract the sugary solid like water does.

The test tube to the right of the oil is water. Water is the universal solvent. We have also done this fun tie dye science experiment testing the solvency of washable markers.

On the other side of the oil is hydrogen peroxide. We noticed the heart floated to the surface. The hydrogen peroxide is a denser liquid than the water, so the heart is likely to float quicker as some of it dissolves.

Below you can see the vinegar and almond milk in action. Almond milk is largely made of water.

YOU MIGHT ALSO LIKE: Valentine’s Day Candy Structures

What liquids will dissolve candy hearts Valentine's Day science activity for kids

Use the printable dissolving candy science worksheet to record your findings. You can record how long it takes for the changes to begin for each liquid and then you can record when the candy is dissolved!

That is if it dissolves at all…

My junior scientist had a great time helping to set up this experiment and checking on the experiment every so often. Getting kids involved in the process is an important part of these types of simple science activities.

Let your kids do as much as they can do and model the rest, so they can try again another time. Also, let them try for themselves, come up with their own observations, and just plain exploring the materials.

Dissolving candy hearts science experiment with different liquid solvents for a solubility activity

Have some fun with your kids this Valentine’s Day and explore solubility with a traditional candy! Make science fun and your kids will be hooked for life. They will be ready and waiting to learn with hands-on science and STEM activities.


More awesome Valentine’s Day chemistry ideas to explore. Click on the photos below.

Valentines Day Chemistry

Charlie Chocolate factory Candy Science Activities



One Comment

Comments are closed.