Internal Assessment – CO2 Factor Lab Essay Sample

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Purpose:

The purpose of the experiment is to determine the amount of CO2 present in a contained space. Using alka-seltzer tablets to control the amount of CO2, which will be an independent factor. The container a 100ml beaker will be the location this occurs, which will be covered with a piece of foil. The amount of water will change accordingly and therefore see which beaker contains the most CO2. I believe that the beaker with the least amount of water will contain the most CO2 because there is more space for CO2 to form.

Materials:

-Alka-seltzer tablets (10)

-Beaker

-Pipette

-Foil

-Distilled water

-Stopwatch

-Bromythol Blue

Procedure:

– First fill a beaker with 5ml, using the pipette, of distilled water and then add two alka-seltzer tablets. Quickly cover the lid to the beaker with the foil. Wait fifteen seconds, using the stopwatch, and then measure the amount of CO2 in the beaker.

– Repeat this process with only different amounts of distilled water. There will be five trials. One with 5ml, 10ml, 15ml, 20ml, and finally 25ml of water.

– Then this entire process will be repeated five times to ensure precision and more accurate values and information.

– To test the amount of CO2 in the beaker, add 40 drops of the bromythol blue liquid. The substance should turn yellow if Co2 is present. The more yellow and darker it gets the more Co2 was expelled.

– Before this process should occur, the bromythol blue should be added to a beaker with only distilled water and no Co2, this will be the control to compare the trials to.

Data:

Test #1

Time: 15 seconds

Trials: Amount of CO2: Amount of water:

1 (A description of the color) 5ml

2 10ml

3 15ml

4 20ml

5 25ml

Test #2

Time: 15 seconds

Trials: Amount of CO2: Amount of water:

1 5ml

2 10ml

3 15ml

4 20ml

5 25ml

Test #3

Time: 15 seconds

Trials: Amount of CO2: Amount of water:

1 5ml

2 10ml

3 15ml

4 20ml

5 25ml

Test #4

Time: 15 seconds

Trials: Amount of CO2: Amount of water:

1 5ml

2 10ml

3 15ml

4 20ml

5 25ml

Test #5

Time: 15 seconds

Trials: Amount of CO2: Amount of water:

1 5ml

2 10ml

3 15ml

4 20ml

5 25ml

Conclusion:

This process is not at all the most accurate way to test the amount of Co2 in a given situation. The factor that would be most unreliable would be the measuring the amount of CO2 in the flask; because some of the gas may have slipped out when the foil was applied to the opening of the beaker. Also the process described above to measure the amount of Co2 in the beaker can be invalid. The observations could be inaccurate and the color may not have been what was recorded.

There is a lot of human error in this experiment. By doing a lot more tests most of these small errors can be avoided and make this experiment more accurate. To better control the variables, such as gas escaping the beaker would be to do it in an enclosed area that measure the amount of Co2 in the specific area. For example, a highly sensitive machine that scans the amount of CO2 can be used so that it is more accurately recorded. There also could be other methods of recording Co2 and many better ways to get Co2 then in an alka-seltzer tablet, and these factors could have severely hindered the overall experiment. Overall my hypothesis was not accurate, the more water touched the surface of the tablets the more carbon dioxide was given off, so therefore the 25ml of water was the amount the expelled most of the Co2 from the tablet.

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