Search for Science Fair Projects

1000 Science Fair Projects with Complete Instructions

Egg with Vinegar

Egg with Vinegar

Share this Science Project:
This page contains full project details. For the summary, please see the Project Summary.

Science Fair Project Description

Discover this fascinating egg experiment with vinegar that makes a bouncy egg! Watch what happens to the shell and the inside of the egg! You'll learn how acid and base chemical reactions and even protein denaturation works!


The hypothesis is that the vinegar (acid) will react with the calcium carbonate (base) in the egg shell, and the vinegar reacts with the proteins in the raw egg.


Acids and bases are different chemical compounds. When we mix an acid with water, it makes hydrogen ions. When we mix a base with water, it makes hydroxide ions. Hydrogen ions and hydroxide ions cause different kinds of chemical reactions. We can measure how acidic or basic something is by checking its pH level. If it's between 1 and 6, it's an acid. If it's between 8 and 14, it's a base. If it's 7, it's neutral. Egg shells are made of calcium carbonate, which is a base. Vinegar is made up of acetic acid. When we put them together, the base in the egg shell reacts with the acid in the vinegar. The acidic vinegar breaks down the basic calcium carbonate in the egg shell. The egg shell dissolves and makes bubbles of carbon dioxide gas. At the same time, the acidic vinegar also reacts with the protein inside the raw egg. The acid denatures the egg protein, making it all tangled up. This makes the egg feel rubbery.

Scientific Terms

Calcium carbonate, acetic acid, acid, base, pH, hydrogen ion, hydroxide ion, neutralization.


  • 2 raw eggs

  • vinegar

  • water

  • 2 jars that are each large enough to hold the egg


Note - this experiment will take 2-3 days.

  1. Place one egg in each jar. Label one jar "vinegar", and the other "water".

  2. Pour enough vinegar in the "vinegar" jar to cover the egg.

  3. Pour enough water in the "water" jar to cover the egg.

  4. Place the jars in a safe place where they will not be disturbed.

  5. After 1 day, check the jars. What do you see?

  6. After 2 days, check the jars again. What do you notice about the egg in vinegar and the one in water? If the egg shell hasn't completely dissolved, continue the experiment for another day.


The egg placed in vinegar had bubbles on the surface of the egg shell. Then the egg shell started to dissolve. The egg placed in water did not dissolve. The most interesting observation was that the egg became rubbery after a few days!


The acidic vinegar reacts with the basic eggshell, creating carbon dioxide bubbles and eventually dissolving the eggshell. The acid-base chemical reaction leads to neutralization when all the acid and base have reacted with each other. The acidic vinegar also reacts with the egg protein, causing the protein to tangle up. This is called protein denaturation, which makes the egg rubbery.

Also consider

Variations of this experiment could include testing different acids, such as lemon juice or orange juice, boiling the egg before adding it to the vinegar or soaking the egg in vinegar with baking soda.

Related videos

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!
Be prepared for a surprise when a raw egg soaks in vinegar! Discover the science behind this surprising chemistry experiment!
Add another variation to the rubbery egg experiment by adding a hard boiled egg to vinegar! What do you think will happen? Follow along with this video from the New Mexico Museum of Space History!
Share this Science Project:

Related Science Fair Project Ideas

Magic Milk Experiment
See colors magically move in milk with soap! This fun experiment demonstrates surface tension in a vivid way!
Sparkling Rainbow Crystal
Make your own sparkling rainbow crystals at home with Borax and see science in action!
Geode Rock Borax Crystal
Make your own sparkling geode rock crystals at home with Borax and see science in action!