======Naked Egg (Bouncy Egg)======


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**Alternative titles:** Egg in Vinegar
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====Summary====                   
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====Procedure====  
  - Place a raw egg in a jar and cover it completely with vinegar. 
  - Observe bubbles forming on the shell as vinegar (acetic acid) reacts with calcium carbonate.  
  - Leave the egg for 48–72 hours.  
  - After soaking, carefully remove the egg, rinse it, and gently rub away any remaining shell.  
  - Examine the “naked egg” - soft, squishy, and translucent. Try gently bouncing it from a small height.  
  - Shine a flashlight through the egg to see the yolk inside.



====Links==== 
How to make bouncing naked eggs - Letterbox Lab: 
{{youtube>As4Vinr8qO4?}}\\

📄🎞️ Bouncy egg - Science Museum Group: [[https://learning.sciencemuseumgroup.org.uk/resources/bouncy-egg/]]\\


====Variations==== 
  * Add food coloring to the vinegar to dye the egg’s membrane.  
  * Combine with [[demonstrations:naked_egg_osmosis|osmosis]] experiments by transferring the egg into corn syrup or salt water.



====Safety Precautions====
  * Handle naked eggs carefully—they are fragile and can burst easily.  
  * Keep raw eggs refrigerated to reduce risk of bacteria.  
  * Wash hands thoroughly after handling raw eggs.  
  * Clean up spills immediately.




====Questions to Consider====
  * What happens to the eggshell when it sits in vinegar? (It dissolves because acetic acid reacts with calcium carbonate, producing carbon dioxide gas.)  
  * Why does the egg feel rubbery after the shell is gone? (Because only the semi-permeable membrane remains, which is flexible and soft.)  
  * Why does the egg sometimes grow larger? (Water moves into the egg through osmosis, making it swell.)  
  * Can you see inside the egg when you shine a flashlight? (Yes, because the hard shell is gone and light can pass through the thin membrane.)  
  * Will the egg eventually burst if bounced too high? (Yes, because the membrane is delicate and cannot withstand strong impacts.)