SAMPLE LESSON · MONTH 2
The Chemistry of Soap — a full lesson, free to read.
This is one of the twelve monthly lessons in The Science of Formulating Curriculum. Same structure as every month: one core project, three age-track notebooks, science concepts taught by explaining what your kids just made.
THE PROJECT
Make real melt-and-pour soap.
Each kid pours their own bar of natural soap, using soap base, a natural colorant, and a chosen essential oil for fragrance. The bars set in under an hour. By the time you've cleaned up, your kids have a soap they made and named — and a working understanding of saponification.
Each kid pours their own bar of natural soap, using soap base, a natural colorant, and a chosen essential oil for fragrance. The bars set in under an hour. By the time you've cleaned up, your kids have a soap they made and named — and a working understanding of saponification.
THE SCIENCE
Three concepts your kids leave understanding.
Saponification
The reaction that turns oils + lye into soap. Mastery track diagrams the molecular rearrangement. Discovery track maps the inputs and outputs. Explorer track names the parts.
pH balance
Why some soaps sting and others don't. Every kid tests their bar with pH strips. Mastery designs a soap targeting a specific pH range.
Surface tension
Why soap actually cleans. The Discovery track runs a 'drop test' with and without soap. The Mastery track explains amphipathic molecules.
WHAT EACH AGE TRACK DOES
One lesson. Three depths.
Every child in your family participates — at their level. The mascots and notebooks make sure no kid is bored or overwhelmed.
🐿️ Explorer (4–7)
Pours soap with help. Draws what they observed. Identifies the colors and smells. Names their bar.
🦊 Discovery (8–11)
Pours soap independently. Hypothesizes + records outcome. Runs the pH test. Compares their bar to a control.
🦉 Mastery (12+)
Designs a variation (e.g., 'higher-glycerin formula'). Writes a full lab report including reaction equation, pH targets, and post-batch reflection.
WHAT'S IN THE BOX
Everything you need for one full lesson.
If you order the $19 First Lesson Box, here's what arrives at your door. If you prefer the free PDF version, the supply list links to where to source each item yourself.
Soap base
Pre-cut soap base, ready to melt — about one-pound block (makes 4 small bars or 2 large).
Natural colorants + mica
Three colorants kids can mix to get any shade.
Soap molds
Silicone molds for clean, easy demolding.
Lab thermometer
A reusable lab thermometer for the temperature reading step.
pH testing strips
Enough strips for every kid's bar plus a few extras.
Lab notebooks + parent guide
Three age-track notebooks + a parent guide with talking points, the science explainer, and an answer key.
Want to actually run this lesson?
Order the supplies for $19 — same lesson, shipped to your door. Or grab the free PDF and source supplies yourself.
Get the free lesson →