Carbon Dioxide from Antacids Lab Report Purpose: To measure the amount of carbon dioxide gas produced when antacid tablets dissolve in water. To compare the number of gas molecules to the volume in a flexible system. Materials: 6 antacids tablets (Alka Seltzer works best!) Mortar and Pestle 3 round rubber balloons Funnel 10ml Graduated Cylinder Tape Measure Procedure: 1. Label the balloons #1, #2, and #3. 2. Crush one antacid tablet using the mortar and pestle and pour the pieces into balloon #1 using the funnel. 3. Crush two antacid tablets using the mortar and pestle and pour the pieces into balloon #2 using the funnel. 4. Crush three antacid tablets using the mortar and pestle and pour the pieces into balloon #3 using the funnel. 5. Using the funnel, add 5ml of water to balloon #1, immediately pinching off the balloon below the funnel to trap the gas being produced. Carefully, tie off the balloon and quickly measure the circumference of the balloon at its largest point. 6. Continue measuring the circumference of the balloon #1 every five minute for twenty minutes while periodically shaking the contents of the balloon. 7. While timing and measuring balloon #1, repeat Step 5 and 6 for balloon #2. 8. While timing and measuring balloons #1 and #2, repeat Step 5 and 6 for balloon #3. Staggering your measurements in this way will allow you to work with all balloons simultaneously as opposed to consecutively (i.e. saving time). Data Table: Balloon 1 Balloon 2 Balloon 3 Initial Circumference (cm) After 5 minutes After 10 minutes After 15 minutes After 20 minutes Analysis: Use the maximum circumference of each balloon to calculate the volume of each balloon. Assume that the balloons are spherical. Show your work and then add your values to your table below. Maximum Radius of Balloon Volume of CO2 Circumference (cm) c=2πr (cm) v = 4πr3/3 (cm3) Balloon 1 Balloon 2 Balloon 3 Conclusion: 1. Make a line graph of balloon volume verses number of tablets. According to your graph, describe the relationship between the number of tablets used and the volume of carbon dioxide gas produced. 2. Assume that the balloon is filled with carbon dioxide gas at 20˚C and standard pressure. Calculate the mass and number of moles of carbon dioxide gas in each balloon at maximum inflation. 3. If a typical antacid tablet contains 2.0g of sodium hydrogen carbonate, show how your carbon dioxide results compare with the theoretical values by calculating your percent yield. 4. How does this lab relate to the concepts being discussed in class? What concept is this lab reinforcing? Be detailed and clear in your response.
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