Lab2 - Uyen Nguyen Global Climate Change and Atmospheric...

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Uyen Nguyen Global Climate Change and Atmospheric CO2 February 12, 2008 Chem 002, Section 005
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Laboratory 2: Global Climate Change and Atmospheric CO2 Introduction : The purpose of this experiment is to evaluate the contribution of human respiration to the total atmospheric concentration of CO2, a “greenhouse” gas that is partially responsible for global climate change. To determine this, students will first calculate the volume of CO2 produced in one breath. Students will then react the CO2 with a solution of calcium hydroxide to form calcium carbonate. Experimental Procedure : Materials: 1 L beaker Ziploc plastic bags Rubber bands Drinking straws 125 mL Erlenmeyer Flask Water 50 mL of 0.02 M Ca(OH)2 Procedures: 1. Fill the 1L beaker with a reasonable amount of water (my initial volume was 700mL). 2. Insert a Ziploc plastic bag into the beaker filled with water. Seal the bag and leave a little gap just big enough to insert a straw. 3. Take one normal deep breath and exhale into the straw. Now, record the final volume inside the beaker. Subtract the initial volume from the final volume to figure out the volume per breath. (Do this three times.) 4. Measure 50mL of 0.02 M Ca(OH)2 and pour it into the Ziploc bag. Seal the bag and leave a little gap just big enough to insert a straw. 5.
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Lab2 - Uyen Nguyen Global Climate Change and Atmospheric...

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