Science Project:

Effects of Chemical Weathering on Rocks

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This science fair project focuses on the carbonation weathering process by which dissolved carbon dioxide in rainwater or moisture in surrounding air forms carbonic acid which reacts with the minerals (calcium carbonate) in some rocks, softeningthem and making it easier for other forces to break the rocks apart.

Carbonated wateris simply water that has had pressurized carbon dioxide forced into it. The liquid is usually kept pressurized in its container to prevent the carbon dioxide from escaping the liquid, but once the pressure is gone (i.e. the container is opened) the carbon dioxide escapes, causing the liquid to bubble. Carbonated water is used in soft drinks, club soda, and seltzer water.

Problem:

Measure and compare effects of chemical weathering,specifically carbonation, on several rock samples.

Materials

  • Package of plastic 8 oz drinking glasses or cups
  • 1-liter bottle of club soda or seltzer water
  • Masking tape
  • Clock or watch
  • 3 fragments of each of the following rock samples: limestone, marble, granite, and sandstone

Procedure

  1. Fill four cups or glasses three-fourths full of carbonated water (club soda or seltzer water).
  2. Fill the remaining four cups three-fourths full of tape water.
  3. Place masking tape on the cups and label them: "limestone and tap water," "limestone and carbonated water," "marble and carbonated water," "marble and tap water," "granite and carbonated water," "granite and tap water," "sandstone and carbonated water," and "sandstone and tap water."
  4. Place the appropriate rock sample fragments into each labeled cup. Set asidea fragment of each type of rock for a control.
  5. Allow the jars to stand for about a 3-4 days.
  6. Remove the rocks from the jars and perform the Mohs Hardness Test(which can be found here) on each, including your control fragments. Were the fragments that had been immersed in carbonated water softer than the others?Record your results.
Author: Mike Calhoun
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