Soap Experiment for Kids: A Fun and Educational Exploration

Soap Experiment for Kids

Soap is a common household item that can be used for more than just cleaning hands and dishes. It can also be the subject of exciting and educational experiments for kids. These experiments not only make learning about science enjoyable but also teach important concepts in chemistry, physics, and even biology. In this comprehensive guide, brought to you by The Kids Point, we will explore various soap experiments suitable for different age groups, ranging from simple activities for younger children to more complex investigations for older kids.

Introduction to Soap and Its Properties

Before diving into the experiments, it’s essential to understand what soap is and how it works. Soap is a surfactant, which means it helps to reduce the surface tension of water and break down oils and fats. This property makes soap an excellent cleaner because it allows water to mix more easily with oils and dirt, lifting them off surfaces.

Basic Ingredients of Soap

  • Fats and Oils: Typically, soap is made from combining fats or oils with a strong alkaline solution, such as lye (sodium hydroxide) or potassium hydroxide.
  • Surfactants: These are the active ingredients in soap that help it clean by interacting with both water and oils.
  • Additives: These include fragrances, colors, and moisturizers, which can affect the soap’s appearance and feel.

Simple Soap Experiments for Young Children

Making Bubble Solution

Objective: To explore how soap creates bubbles and experiment with making different types of bubbles.

Materials Needed:

  • Liquid dish soap
  • Water
  • Bowl
  • Spoon
  • Straw or bubble wand
  • Optional: Glycerin (for stronger bubbles)


Mixing the Solution:

  • In a bowl, mix together 1 part liquid dish soap with 4 parts water. For stronger bubbles, add a few drops of glycerin.
  • Gently stir the mixture with a spoon to combine.

Blowing Bubbles:

  • Dip the straw or bubble wand into the bubble solution.
  • Blow gently through the straw or wave the bubble wand to create bubbles.
  • Observe the size and shape of the bubbles formed.


  • Surface Tension: The soap molecules reduce the surface tension of the water, allowing it to stretch and form bubbles.
  • Stability of Bubbles: Adding glycerin helps to strengthen the bubbles by slowing down the evaporation of water from the bubble’s surface.


  • Experiment with different soap brands or concentrations to see how they affect bubble formation.
  • Try making bubbles in different temperatures of water and observe any differences.

Floating Soap Boat

Objective: To explore buoyancy and the properties of soap as a material.

Materials Needed:

  • Small piece of soap (a bar or a slice)
  • Container of water (large enough to float the soap boat)
  • Optional: Toothpick or small stick, paper sail


Preparing the Soap Boat:

  • Take a small piece of soap and carve it into the shape of a boat using a butter knife or small carving tool.
  • Optionally, attach a paper sail to a toothpick or small stick and insert it into the soap boat.

Testing Buoyancy:

  • Fill the container with water.
  • Place the soap boat gently on the surface of the water and observe what happens.


  • Buoyancy: The soap boat floats because soap is less dense than water. This property allows it to displace enough water to support its weight without sinking.


  • Experiment with different shapes and sizes of soap boats to see how they affect buoyancy.
  • Compare the floating ability of the soap boat with other materials, such as plastic or metal.

Intermediate Soap Experiments for Older Children

Surface Tension Investigation

Objective: To observe and measure the effects of soap on water’s surface tension.

Materials Needed:

  • Small bowl or dish
  • Water
  • Liquid dish soap
  • Pepper or small pieces of paper


Setting Up the Experiment:

  • Fill the bowl with water nearly to the brim.
  • Sprinkle a small amount of pepper or place small pieces of paper on the water’s surface.

Observing Surface Tension:

  • Before adding soap, observe how the pepper or paper pieces float on the water without sinking.

Adding Soap:

  • Dip a cotton swab or small finger into the liquid dish soap.
  • Gently touch the surface of the water with the soapy swab or finger near the pepper or paper pieces.

Observing the Effect:

  • Observe how the pepper or paper pieces move away from the soap, indicating a change in surface tension.


  • Surface Tension Reduction: The soap molecules disrupt the water’s surface tension, causing the pepper or paper pieces to move away from the soapy area.


  • Measure the distance the pepper or paper moves from the soap to quantify the effect of soap on surface tension.
  • Experiment with different concentrations of soap or types of soap to observe any variations in the effect.

Soap and Oil Experiment

Objective: To investigate how soap interacts with oils and why soap is effective in cleaning.

Materials Needed:

  • Small bowl or dish
  • Water
  • Vegetable oil or cooking oil
  • Liquid dish soap
  • Spoon or stirring rod


Mixing Oil and Water:

  • Fill the bowl with water about halfway.
  • Pour a small amount of vegetable oil into the water.

Observing Separation:

  • Observe how the oil forms a separate layer on top of the water and does not mix.

Adding Soap:

  • Add a few drops of liquid dish soap to the oil and water mixture.

Observing Emulsification:

  • Gently stir the mixture with a spoon or stirring rod.
  • Observe how the soap causes the oil and water to mix temporarily.


  • Emulsification: Soap molecules have hydrophilic (water-attracting) and hydrophobic (oil-attracting) ends. When added to oil and water, soap molecules surround the oil droplets, allowing them to mix with water temporarily.


  • Experiment with different oils (e.g., olive oil, coconut oil) to observe any variations in emulsification.
  • Investigate how temperature affects the emulsification process by heating or cooling the mixture.

Advanced Soap Experiments for Teens and Beyond

Soap and Micelles

Objective: To understand the formation of micelles and how soap molecules interact with dirt and grease.

Materials Needed:

  • Small bowl or dish
  • Water
  • Liquid dish soap
  • Vegetable oil or cooking oil
  • Food coloring (optional)


Preparing the Mixture:

  • Fill the bowl with water about halfway.
  • Add a small amount of vegetable oil to the water.
  • Optionally, add a few drops of food coloring to visualize the process.

Adding Soap:

  • Add liquid dish soap to the oil and water mixture.

Observing Micelle Formation:

  • Observe how the soap molecules form micelles around the oil droplets.


  • Micelle Formation: Soap molecules arrange themselves with their hydrophobic tails surrounding the oil droplets and their hydrophilic heads facing outward toward the water. This structure allows the oil to be suspended in water as part of the micelle, facilitating its removal.


  • Explore how different types of soap (liquid vs. bar soap, different brands) affect micelle formation.
  • Investigate the environmental impact of soap and micelle formation in wastewater treatment processes.

Soap is a versatile substance that not only cleans but also provides a wealth of opportunities for educational experiments. Through these hands-on activities, children can explore scientific concepts such as surface tension, emulsification, and micelle formation in a fun and engaging way. Whether they are making bubbles, floating soap boats, or investigating the interaction between soap and oils, these experiments encourage curiosity, critical thinking, and a deeper understanding of the world around them. By fostering a love for science early on, soap experiments can inspire the next generation of scientists and innovators.

Incorporating these soap experiments into educational settings, such as classrooms or home learning environments, can enrich science curricula and spark enthusiasm for STEM (Science, Technology, Engineering, and Mathematics) subjects. By encouraging children to ask questions, make predictions, and draw conclusions from their observations, these experiments not only teach scientific principles but also nurture essential skills such as problem-solving and experimentation.

So, gather your materials, prepare to get a little soapy, and embark on an educational adventure with soap experiments for kids, brought to you by The Kids Point!

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