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Old 12-04-2005, 04:54 PM
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ineed2no ineed2no is offline
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Dear mad scientist, this is an urgent message from ineed2no umm.... i need to have an introduction for my project "Examine how much carbon dioxide is produced by different gas sources?" i was wondering could you give tips and perhaps an introduction?
please reply.......
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Old 12-04-2005, 05:10 PM
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Default Well...

Well, I am not Mad Sci, but I'll try to help,
First, what grade are you in,
Second, I need alittle more info(experiment, hypothsis, what are you trying to say in explaination) before I can properly help you.
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Old 12-04-2005, 05:58 PM
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ummm here is what i have so far.... RESEARCH
(helps us understand the impact of these gas sources on global warming)
PURPOSE
To compare the amount of Carbon Dioxide (CO2) in four different sources of gases. By doing this I will able to use my data to construct a chart to determine which gases may be safe, and appropriate for such a situation in the Greenhouse. With this in mind, routine activity in our atmosphere and environment can be altered. The results would be cleaner air, safer Ozone and an equal balance in nature.HYPOTHESIS
I hypothesize that my purpose will be fulfilled and all data accurate and useful. I believe based on my research, I will be able to compare the amounts. Based on those results, one can tell which gas may appear safe and useful.
experimental plan: Lab Procedure: Purpose: To compare the amount of Carbon Dioxide (CO2) in four different sources of gases.

1. Add 15 mL of water and 10 drops of bromthymol blue indicator solution to each vial or test tube. Label the vials A, B, C, D, and Control.

2. Fill each balloon until it has a 7.5 diameter.
Sample A (Ambient Air) - Use a tire pump to inflate the balloon to the required diameter. Twist the rubber neck of the balloon and fasten it shut with a twist tie. The tie should be at least 1 cm from the opening of the balloon. Record the color of the balloon used for this sample.
Sample B (Human Exhalation) - Have one team member blow up a balloon to the required diameter. Twist and tie the balloon, and record balloon color.
Sample C (Automobile Exhaust) - Your teacher will supply you with this balloon. Record the color.
Sample D (Nearly pure CO2) - Put 100 mL of vinegar in the narrow-necked bottle. Using a funnel, add 5 mL of baking soda. Let the mixture bubble for 3 seconds to drive the air out, then slip the balloon over the neck of the bottle. Inflate the balloon to the proper diameter. Twist, tie, and record the color.

3. Soften the clay and wrap it around one end of the straw to make a small airtight collar that will fit into the neck of a balloon. The collar should look like a cone with the straw in its middle, and should be large enough to plug the neck of the balloon.

4. Pick up Balloon A. Keeping the tie on it, slip the balloon's neck over the clay collar and hold it against the collar to make an airtight seal. Place the other end of the straw into the vial of water and bromthymol blue labelled A. Have another partner remove the tie on the balloon and slowly untwist the balloon. Keeping the neck of the balloon pinched to control the flow of gas, gently squeeze the balloon so the gas slowly bubbles through the solution.

5. Repeat the same procedure with the other balloons and their respective vials. In some cases, the bromthymol blue solution will change color, from blue to yellow, indicating the presence of carbonic acid formed from CO2.

6. Analyze each of the samples by titrating them with drops of dilute ammonia. Ammonia neutralizes the carbonic acid. The bromthymol blue will return to a blue color when all the acid has reacted. Add drops of ammonia to each of the samples that turned yellow, carefully counting the number of drops needed until they are about the same color as your control. Record the results.

Last edited by ineed2no; 12-04-2005 at 06:08 PM..
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