Ready, set, go! Can you separate salt and pepper once they’re mixed together? In this super simple science experiment you can!
We’ve included a demonstration video, printable instructions, and an easy to understand explanation of how it works below.
Let’s mix together some salt and pepper and then use science to separate them!
JUMP TO SECTION: Instructions | Video Tutorial | How it Works
- Empty Dish
- 2 Tablespoons of Table Salt
- 1 Teaspoon of Black Pepper
- Plastic Comb
Separate Sale and Pepper Science Experiment Instructions
Step 1 – Begin by adding 2 tablespoons of salt onto an empty plate.
Step 2 – Next, add 1 teaspoon of pepper to the salt and gently shake the plate to combine the salt and pepper.
Step 3 – Take a clean plastic comb and run it through your hair a few times. Then position the comb above the salt and pepper and watch what happens. Take a moment to write down your observations.
Do you know what caused the pepper to jump onto the comb? Find out the answer in the how does this experiment work section below.
How to Separate Salt & Pepper Science Experiment Step by Step Instructions
How Does the Science Experiment Work
Most objects do not have a positive or negative charge, they are neutral. Some objects, like hair combs, have the ability to become charged. At the beginning of the experiment, the comb has a neutral charge. When you run the comb through your hair, you give it an electrical charge. Running the comb through your hair allows electrons from your hair to move onto the comb. This gaining of electrons gives the comb an overall negative charge.
The pepper jumps to the comb for two reasons. The first reason is that grains of pepper are much lighter than grains of salt. If any salt does jump up to the comb, it will likely just fall back because it is too heavy. The second reason that pepper jumps to the comb is because of the idea that unlike electric charges attract. Remember the comb is negatively charged, so this negative charge attracts the positive charge in the grains of pepper. How does the pepper get a positive charge? Pepper polarizes easily, meaning the electrons move to one end of the pepper grain and the protons move to the other end. This leaves one end of the pepper grain with a negative charge and the other end with a positive charge. Salt does not polarize nearly as quickly as pepper.
The outcome of this experiment is a result of static electricity. Static electricity is a stationary (not moving) electric charge that is caused by friction. Lighting in the sky is a result of static electricity!
Other Ideas to Try
Try this experiment with other spices from your spice drawer! Try sugar, yeast, gelatin, garlic powder, garlic salt, lemon pepper seasoning, etc. and see what else is attracted to the negatively charged comb.
More Science Fun
Try your hand at these other experiments that involve static electricity:
- Make Your Hair Stand on End
- Static Flyer – The Flying Bag
- Bending Water Experiment
I hope you enjoyed the experiment. Here are some printable instructions:
Separate Salt and Pepper Science Experiment
Put mixture into water
stir and wait salt to dissolve
strain with coffee filter
dry what remains on filter (pepper)
Boil out water and enjoy pure salt.
hi, I am Deborah. This experiment is very cool. Thankyou .bye.
Sher P says
Can’t wait to show my 4th graders. Sounds like a cool experiment
Wow…I can’t wait to show it to my science teacher?cool
Laura Petkovic says
I just tried it with my sons & it was so cool to see their expressions!
Marylee Thomason says
I love the simplicity of your experiments and especially the way to explain the science behind them. Very helpful!