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Activity

Egg shell removal

Summary: 
Remove the shell from an egg with a chemical reaction
Science content (2016 curriculum): 
Chemistry: Atoms, Molecules (3-7)
Chemistry: Chemical Changes (2, 7)
Materials: 
  • egg
  • vinegar
  • mug or glass jar
Procedure: 

Submerge an uncooked egg in vinegar.
Wait a few days to a week.

The shell will bubble as the vinegar reacts with the calcium carbonate in the shell, releasing carbon dioxide gas:
CaCO3 + 2CH3COOH -> Ca(CH3COO)2 + H2O + CO2

The hard shell reacts away completely, leaving the egg surrounded just by the outer membrane.
The egg is soft, but still intact.

Grades taught: 
Gr 3
Gr 5
Teacher: 
Ingrid
Teaching site: 
JEMZ+ After school science