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in Valentine's Day STEM Activities

Salt Crystal Hearts Science Experiment

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This Valentine’s Day, make your valentine these adorable salt crystal hearts! How are they made? Find out in this simple science experiment where you learn how to make salt crystals.

We love simple science projects, and one of our favorites has been making salt crystals. These crystals are low-cost and turn out perfect nearly every time!

This time, make salt crystal hearts for Valentine’s Day science learning.

This Valentine's Day, make your valentine these adorable salt crystal hearts! How are they made? Find out in this simple science experiment!

Making Heart Salt Crystals in a Jar

Related: Valentine’s STEM Activities for Kids

Try this fun Valentine’s Day themed science experiment and combine learning with the holiday of love. This post contains affiliate links at no cost to you for your convenience.

valentine stem challenge cards

What you’ll need to make Valentine crystals:

  • Salt
  • Glass mason jars (1 for each heart)
  • chenille stems (1 for each heart)
  • Clothespins (1 for each heart)
  • String
This Valentine's Day, make your valentine these adorable salt crystal hearts! How are they made? Find out in this simple science experiment!

How Do You Make Salt Crystals?

Fill your jars about 3/4 of the way full with water. Dump this water into a pot on the stove. Heat the water until it boils. Slowly add salt into no more salt can dissolve in the water and crystals start to form on the surface of the water. Remove from heat.

Fill the mason jars 3/4 of the way full of the salt water.

Bend a chenille stems  into the shape of a heart. Make sure the heart can fit through the mouth of the jar. Once the crystals form it will be hard to get it out of the jar if it is too big.

Tie a string (or you can use another chenille stem) to the point of each heart. Use a clothespin to suspend the heart in the center of each jar.

Set the jars in a sunny place and let the crystals start to form. The longer you leave them, the more they will grow!

We recommend leaving your salt crystals to grow for at least three days.

This Valentine's Day, make your valentine these adorable salt crystal hearts! How are they made? Find out in this simple science experiment!

Take this further by comparing the size of crystal formation after 24 hours, 48 hours, 72 hours, and a week. How much bigger are the crystals after a week?

Carefully remove the crystals from the water and let them dry on a paper towel.

This Valentine's Day, make your valentine these adorable salt crystal hearts! How are they made? Find out in this simple science experiment!

Inspect the crystals with a magnifying glass or microscope. Each crystal has a rectangle shape!

Salt Crystal Hearts Science

This Valentine's Day, make your valentine these adorable salt crystal hearts! How are they made? Find out in this simple science experiment!

When salt water evaporates, the water can no longer hold all of the salt molecules. When this happens, the salt crystals cling to anything nearby, including the rim of the jar and the chenille stems inside of the jar.

Over time, as the water evaporates, the salt crystals get bigger and bigger, making pretty, square crystals that are amazing to look at! Use a microscope to investigate these salt crystals up close for even more science fun!

valentine stem challenge cards

Valentine’s Day STEAM Activities

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Filed Under: Valentine's Day STEM Activities Tagged With: elementary, jar, salt, valentines day

About Brenda Priddy

Brenda grew up thinking she hated science.

But when her 4-year- old daughter was more interested in reading science facts than fairy tales, Brenda realized she had to learn more about science to keep up with her daughter.

Through simple at-home science experiments, Brenda developed a passion for science and now acts as an advocate for STEM education for kids at her website STEAMsational.com.

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What is STEAM?

STEAM activities for kids promote the idea that science, technology, engineering, art, and math can all work together to help kids become critical thinkers, problem solvers, and innovators!

Join us on our journey to discover just how much fun science experiments can be.

What we do… 

STEAMsational offers STEM and science lesson plans and teaching resources to provide a firm STEM foundation for children in the classroom or home.

All you need to do is find your supplies, gather your scientists, and let the innovation unfold.

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