Skip to Content

Soap Making Science Project-Saponification at Work!

Save this idea for later!

Soap making is super cool and science-y. But traditional soap making is a bit dangerous for kids in elementary school. The chemical reactions can burn the skin or eyes. So, if you want to make a soap making science project, what can you do?

The best way to learn how to make soap with kids is to use melt-and-pour soap. Keep reading to learn about how to set up science projects for kids at home using melt-and-pour.

This soap making science project is the perfect easy science project for elementary kids! Takes just 1 hour and 2 ingredients!

If you like this science project, check out our science experiments for kids and STEM activities for kids!

How to Set Up a Soap Making Science Project

A soap science project has to include variables to test and a question to answer. For this particular experiment, we asked the question, what melting method is the best for glycerin soap?

stem challenge worksheet

Soap Science Project Question

We tested if melting the soap in the microwave, stove, or oven was the most effective method.

You might also want to try different soap blends, see which type of soap cleans the best, or allow your students to come up with their own questions.

Soap Science Project Hypothesis

Stage two of any science project is a hypothesis. Determine what you think will happen or what you think the best solution will be.

We thought perhaps the stove would be the best melting method.

Soap Science Project Test

During this stage, kids should test variables to see if their hypothesis is correct or incorrect.

Soap Science Project Results

Lastly, you should record the results of your experiment and identify if your hypothesis was correct or incorrect.

What You Need for the Soap Making Science Project

supplies for making soap

For this project, you’ll need:

How to Make Soap with Kids

This soap making science project is the perfect easy science project for elementary kids! Takes just 1 hour and 2 ingredients! Learn how to make soap with kids!

Cut soap into 1”x1” cubes and place in measuring cup.

Heat the oven to 200 degrees Fahrenheit.

Divide your soap evenly between 3 containers: 1 for the oven, 1 for the microwave, and 1 for the stove.

Heat each batch of soap until fully melted. Track how long it takes to melt the soap in each area. Heat in the microwave in 30-second intervals. Heat on the stove using low heat.

Label your molds to keep track of how you melted it. One mold should be labeled oven, one stove, and one microwave.

Once the soap is melted, pour a small amount of soap into each mold, just to fill the bottom of the mold.

melt and pour soap for kids

Place a bug into each mold face down (because the bottom is the top on these molds), and move around to fit as necessary.

Fill the rest of each mold with soap.

filling soap mold

Spray the top of each soap filled mold with alcohol to reduce bubbles.

Allow soap to set for an hour or more before removing them from the mold.

spraying soap with alcohol

Once the mold is set, remove the soap and inspect. Are there differences in clarity and how well the soap lathers?

bug soap

Record the differences and then use the data from your melt-time test to determine the best method for making melt-and-pour soap.

stem challenge worksheet

More Science Projects to Try

The 10 Best Science Project Kits for Kids

Energy-Efficient Windows Science Project

Science Fair Projects for Active Kids Who Need to Move

Save this idea for later!