Problem What are the effect of soda on tooth enamel?
Hypotheses The darker colored soda has more corrosive effects than lighter colored soda. The pennies left in the darker colored soda will look less tarnished than the pennies in lighter soda.
Abstract The purpose of this project was to determine the effects of soda on corrosion of the tooth enamel. The project was to determine which sodas caused more corrosion; lighter colored or darker colored. The hypotheses of the project were that the darker colored soda has more corrosive effects than lighter colored soda. The pennies left in the darker colored soda will look less tarnished than the pennies in lighter soda. The first part of the procedures in this project was to locate six pennies with the same amount of tarnish on them. Each penny was placed in a cup with one cup of each soda used. One cup contained distilled water and the others contained Coke, Dr. Pepper, Sprite, Mountain Dew, and Pepsi. The pennies were placed in each cup and left for seven days. Each day in the afternoon, the pennies were checked for corrosiveness or amount of tarnish worn off the penny. Each penny was dried off and laid on a white note card and given a numerical measure of 0-10. All of the pennies started out with the rating of 10, meaning the most amount of tarnish and a 0 rating was no tarnish left. The pennies were photographed on the first and last day.
Variables, Constants,&Controls Manipulated Variable: The type of soda in the cup. Responding Variable: The amount of corrosion on the penny. Constants: The amount of soda in the cup. The amount of tarnish on the penny. The size of the cup. The amount of time the penny spends in the soda. Control: One cup filled with distilled water.
Materials 1 small bottle of Coca Cola 1 small bottle of Pepsi 1 small bottle of Dr. Pepper 1 small bottle of Sprite 1 small bottle of Mountain Dew 1 small bottle of distilled water Six plastic cups Six tarnished pennies Journal or Logbook Measuring cup Permanent marker for labeling
Procedures1. Fill a plastic cup with 1 cup (measured) of the Coca Cola soft drink. Make sure each cup is labeled with the liquid that is contained within it.2. Repeat step one with the remainder of the cups, filling each one with a different soft drink and finally, the water.3. Drop each of the tarnished pennies in a separate cup. The penny that is soaking in the cup of distilled water will be your control.
Conclusion The conclusion of the project is that the darker colored sodas did cause more corrosion overall than the lighter colored sodas. Although Pepsi did not have as much corrosion as Dr. Pepper and Coke and Sprite had more corrosion than Pepsi, it cannot be determined that darker colored sodas cause more corrosion.