Our experiment tested the amount of carbonation in a club soda bottle at certain depths. The carbonation in the club soda resembles nitrogen in a scuba diver diving at deeper depths. We would open a club soda under water at a designated depth, and catch the bubbles in a 40 oz. bottle with a funnel glued on to one of its ends. Our hypothesis was that the deeper the club soda was, the less carbonation there would be. Our results matched our hypothesis.
Our results show that the deeper a club soda goes, the less carbonation it has. The closer it is to the surface, the more carbonation it has. We had three trials at depths of four feet, eight feet, twelve feet, and sixteen feet. The pool at Long Beach was only sixteen feet deep, and we only had an hour to do our experiment. We would have liked to experiment at more depths, but we wouldn’t have had time.
We figured out that our experiment confirms Henry’s Law. *Henry’s Law states that the mass of a gas that dissolves in a definite volume of liquid is directly proportional to the pressure of the gas provided the gas does not react with the solvent. When a person is scuba diving they are breathing air from the scuba tanks. The air contains 80% nitrogen. When they breathe in the nitrogen, it passes through the body’s nervous tissues, the fatty tissues to be precise, and it is stored in those fatty tissues. However, when the scuba diver gets deeper the nitrogen will dissolve into tissue. Therefore they will wreak havoc in the nervous system. This is called, “The Bends”. Our results with club soda resemble the same effect if the club soda actually was a human being scuba diving under water. We were not able to determine the exact depth at which would occur, because the deepest depth we could experiment was sixteen feet, and there was still carbonation.
There was definitely room for error in our experiment. When we opened the club soda under water, the bubbles would flow into the 40 oz. Bottle, as it should. However, some of the liquid in the club soda would flow into the bottle, obliterating the carbonation flowing into the bottle. It was also difficult for Conor to hold our experiment design and club soda under water, without moving it from its designated depth. With our results, we calculated our average deviation and error for each depth. We found that the deeper we went under water to experiment, the more error occurred. We should have been more careful when were exhaling under water, and made sure that those bubbles didn’t flow into the bottle.
We would have liked to make some changes to our experiment. James did not dive the day we experimented at the pool in Long Beach, because he was sick. Therefore, we would have at least three people helping us hold the experiment design secure in its designated depth. We would experiment with four or maybe five trials, if we had the time. We would conduct our experiment at more depths, and we would like to go much deeper, since we did not have an answer as to what depth at which there would no longer be carbonation in the club soda. We would have also liked to experiment in both salt water and chlorine water, and compare the results.
We never actually answered our problem statement as to at which depth will there be no carbonation in a club soda. So we know carbonation will recede when the club soda is deeper than sixteen feet. We both estimated that there will be no carbonation when the club soda is around 30 feet under water (look at graph).

Generally, we think our project was somewhat a success. Our experiment worked, but we couldn’t have answered our problem statement, because we needed to go deeper in the water. However, we successfully established our goal of having our experiment confirming Henry’s Law.

* found at http://www.chem.purdue.edu/gchelp/gloss/henryslaw.html


b a c k