MAY 14, 2016 07:51 PM PDT

The Chemistry Behind the Egg Shell and Vinegar Experiment


The egg shell in vinegar experiment demonstrates how calcium carbonate reacts with acetic acid. About 95 percent of an eggshell is made up of calcium carbonate. Other materials mostly made from calcium carbonate include seashells and limestone. The remaining 5 percent of the eggshell is made up of calcium phosphate, magnesium carbonate, and proteins.

About 3 percent of vinegar is acetic acid.

When you put an egg into a glass of vinegar, bubbles of carbon dioxide immediately begin to form around the entire egg. The egg shell dissolves within 24 hours, leaving behind a squishy bouncy translucent egg.

According to the Department of Physics at the University of Illinois at Urbana-Champaign, the chemical reaction behind this is such: CaCO3+ 2H+ -> Ca+2 + H2O +CO2
About the Author
  • Julianne (@JuliChiaet) covers health and medicine for LabRoots. Her work has been published in The Daily Beast, Scientific American, and MailOnline. While primarily a science journalist, she has also covered culture and Japanese organized crime. She is the New York Board Representative for the Asian American Journalists Association (AAJA). • To read more of her writing, or to send her a message, go to Jchiaet.com
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