# Carbon Dioxide from Antacids Lab Report - DOC - DOC

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```					Name __________________                                                           Date _____________
Period _________

Carbon Dioxide from Antacids Lab

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.

Question: What is the relationship between the number of gas molecules and the volume?

Hypothesis:

Materials:      6 antacids tablets                                 String
3 round rubber balloons                            Ruler

Procedure:
1. Label the balloons #1, #2, and #3.
2. Place one antacid tablet inside balloon #1. Crush the antacid tablet once it is inside the balloon. Be
careful not to break the balloon.
3. Place two antacid tablets into balloon #2. Crush the antacid tablets once they are inside the balloon. Be
careful not to break the balloon.
4. Place three antacid tablets into balloon #3. Crush the antacid tablets once they are inside the balloon.
Be careful not to break the balloon.
5. Carefully add 5 mL of water to balloon #1 and immediately tie off the balloon to trap the gas being
produced.
6. Quickly measure the initial circumference of the balloon at its largest point by placing the string around
the largest part of the balloon and then measuring the length of the string (in cm) with the ruler. Record
this measurement in the data table below.
7. Continue measuring the circumference of the balloon #1 every five minutes for twenty minutes while
periodically shaking the contents of the balloon.
8. While timing and measuring balloon #1, repeat Step 5 and 6 for balloon #2.
9. 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
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
number of moles of carbon dioxide gas in each balloon at maximum inflation.

3. If a typical antacid tablet contains 0.024 moles of sodium hydrogen carbonate (and therefore 0.024
moles of carbon dioxide), show how your carbon dioxide results compare with the theoretical values by

4. Describe any sources of error.

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