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Rock On
Try This Science Lab
rock-on

Limestone

Photograph by DonNichols, iStockphoto

Fizzy Fun

Try this experiment!

 

YOU WILL NEED

  • Vinegar
  • Glass
  • Small chunk of limestone rock
  • Several different rock types

HERE'S HOW

 

Pour a half cup of vinegar into a glass. Add a small chunk of limestone rock. (Find limestone outside using a rock identification book or buy a piece at a hobby shop). Watch closely. After a few minutes the rock will start to fizz. Now try the same test with other rocks and minerals. You may not see any bubbles.

 

WHY?


Vinegar, an acid, dissolves bits of a material called calcium carbonate in the limestone. This releases carbon dioxide, a gas that rises to the surface as a stream of bubbles. Rocks that don't contain calcium carbonate won't fizz.

 

 

Text by David George Gordon

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