__Hypothesis:__We think that as depth increases the amount of carbon dioxide gas will decrease.

We believe that as the depth increases, the volume of gas released will decrease as well.

To back up our belief, we used the equation: concentration of gas at surface*volume of CO2 bubbles at the surface= concentration of gas at a certain depth*volume of bubbles at that depth (what we are testing.)

First, we tested the volume of bubbles at 1 atm, on the surface, to get the control. The results were 225 mL of CO2 bubbles at 1 atm.

Next, we needed to find the concentration of the gas at the surface, and at each depth we are testing. To do this we used Henry's Law equation- P=KC. Since we were solving for C, we made the equation C=P/K.

Although, to do this we needed to know how many atmospheres we are testing under. Since we were not fully going down 2 atmospheres, 33 feet, we had to find how many atmospheres, 5, 10, and 15 feet were.

To do this, we made a table showing how many feet per atmosphere. 1 atmosphere (y variable) every 33 feet (x variable), then we got our slope 1/33 and our y-intercept to make an equation. Our y-intercept was 1 because at 0 feet we are under 1 atmosphere. Then we solved plugging in 5, 10, and 15 feet, and made a graph.

Once we found our atmospheres we could use Henry's Law Equation. We knew P (how many atmospheres we were under) K (Henry's Law constant for CO2 which is 29.76), so we could solve for C.

Once we solved for C, and found the Concentration of the gas at different depths we were testing, we were able to plug it into the equation and solve for the volume of CO2 bubbles released at 5, 10, and 15 feet. We got these results:

To back up our belief, we used the equation: concentration of gas at surface*volume of CO2 bubbles at the surface= concentration of gas at a certain depth*volume of bubbles at that depth (what we are testing.)

First, we tested the volume of bubbles at 1 atm, on the surface, to get the control. The results were 225 mL of CO2 bubbles at 1 atm.

Next, we needed to find the concentration of the gas at the surface, and at each depth we are testing. To do this we used Henry's Law equation- P=KC. Since we were solving for C, we made the equation C=P/K.

Although, to do this we needed to know how many atmospheres we are testing under. Since we were not fully going down 2 atmospheres, 33 feet, we had to find how many atmospheres, 5, 10, and 15 feet were.

To do this, we made a table showing how many feet per atmosphere. 1 atmosphere (y variable) every 33 feet (x variable), then we got our slope 1/33 and our y-intercept to make an equation. Our y-intercept was 1 because at 0 feet we are under 1 atmosphere. Then we solved plugging in 5, 10, and 15 feet, and made a graph.

Once we found our atmospheres we could use Henry's Law Equation. We knew P (how many atmospheres we were under) K (Henry's Law constant for CO2 which is 29.76), so we could solve for C.

Once we solved for C, and found the Concentration of the gas at different depths we were testing, we were able to plug it into the equation and solve for the volume of CO2 bubbles released at 5, 10, and 15 feet. We got these results:

This graph, shown below, shows the equation to find how many atmospheres were in 5, 10, and 15 feet.

This graph below shows the final equation, cocentration of gas at surface*volume of CO2 bubbles at the surface= concentration of gas at a certain depth*volume of bubbles at that depth. Once we simplified this equation, by knowing the concentration at 0 feet and the amount in mL at 0 feet, the equations simplified to: 7.56048/x=y. Keep in mind that, y= volume of the bubbles, and x= the concentration of gas, not the depth.

After Pali, things did not go as planned, due to the error we got. We believe that there was error in our results because the water bottles were shaken before they were used in our test. If the water bottles are shaken it causes the volume of bubbles to increase, and this is why the results were not accurate and did not follow our hypothesis. We will test again at the St. Matthew's pool, making sure that all the bottles are properly taken care of and not shaken. At the St. Matthew's pool we will be testing 0, 5 and 8 feet. Here is our hypothesis for this new test.