Balloon Lab
Purpose: To measure the amount of carbon dioxide gas given off when
antacid tablets dissolve in water.
Procedure:
1. Obtain 6 antacid tablets, 3 balloons, a ruler, a piece of string, and a data
sheet from the prep table.
2. Break apart antacid tablets and place correct number into each balloon.
(Refer to table.)
3. Add the correct amount of cold water to each balloon (using a pipette).
Immediately tie off each balloon. (Refer to table.)
4. Shake the balloons to mix the contents. Allow the contents to warm to
room temperature.
5. For 20 minutes, measure and record the circumference of each balloon
every 2 minutes. KEEP TRACK OF YOUR OWN TIME!
6. Record the maximum circumference for each balloon in the first row of
your data sheet.
7. Clean up stations. Place balloons in trash can. Wipe off countertops at
your lab station. Wash and dry any equipment that was used and place
back in correct lab drawer.
8. Complete the remaining calculations on the data sheet with your
partner.
Table 1
Substances to Add to Balloons
Balloon
# of Antacid
Amount of
#
Tablets
Water (mL)
1
1
5
2
2
10
3
3
15
Table 2
Circumference Measurements
Time
(unit?)
2:00
4:00
6:00
8:00
10:00
12:00
14:00
16:00
18:00
20:00
Balloon 1
Circumference
(unit?)
Balloon 2
Circumference
(unit?)
Balloon 3
Circumference
(unit?)
Formal Lab Report
Carbon Dioxide from Antacid Tablets
Please refer to the lab on page 428 in your text for procedures.
Your lab report should include the following:
I.
II.
III.
IV.
V.
Cover Page: Title, Name, Partners’ Names, Due Date (1 point)
Purpose (1 points)
Hypothesis (2 points)
Analysis (82 points)
A. Data Tables (67 points)
B. Graph (15 points)
Conclusion (12 points)
A. Restate your hypothesis. Based on your results, explain if your
hypothesis was verified or refuted. (2)
B. Discuss your percent error overall and for each balloon. (4)
C. Include a minimum of two for each of the following questions.
1. What are some errors that may have occurred in the lab to
contribute to your percent error? (2)
2. If you were to perform this lab again, how would you
improve it or what would you do differently? (2)
3. What suggestions would you give to someone who is going
to perform this lab for the first time? (2)
Parts I, II, III, and V of your report must be typed in black ink in 12 point
Times New Roman (or similar) font and 1 inch margins. Reports not
typed will not be graded. You do not need to type the table or the graph, but
it must be neat. Please see your teacher if typing this report presents a
hardship for you. This report will be due
This sheet must be turned in with your lab report.
Formal Lab Report
Cover Page (1)
Purpose (1)
Hypothesis (2)
Data Table (Circumference) (10)
Data Table (Calculations) (57)
Graph (CO2 Production) (15)
Conclusion (12)
Format (2)
Points Earned
Total Points: ____________
Name: ______________________
Chemistry I H
Balloon Lab
Name
Data Table: Circumference Measurements
Balloon 1
Balloon 2
Time
Circumference
Circumference
(unit?)
(unit?)
(unit?)
2:00
4:00
6:00
8:00
10:00
12:00
14:00
16:00
18:00
20:00
Balloon 3
Circumference
(unit?)
Chemistry I Honors
Name
Balloon Lab
Partner Name
Show all calculations.
Balloon 1
Circumference (c)
of Balloon (cm)
Radius (r=c/2)
Volume of Sphere
(4r3/3)
Number of moles of
CO2
Mass of CO2
Theoretical Volume
Percent Error
Balloon 2
Balloon 3
Chemistry I CP
Name
Balloon Lab
Partner’s Name
Show all calculations.
Balloon 1
Circumference (c)
of Balloon (cm)
Radius (r=c/2)
Volume of Sphere
(4r3/3)
Number of moles
of CO2
Mass of CO2
Balloon 2
Balloon 3
Example Data: (for students who miss the lab)
Circumference Measurements
Time
(min)
2:00
4:00
6:00
8:00
10:00
12:00
14:00
16:00
18:00
20:00
Balloon 1
Circumference
(cm)
20.74
21.98
23.05
23.77
24.84
25.00
24.88
24.65
24.13
23.86
Balloon 2
Circumference
(cm)
25.03
26.94
27.30
28.22
28.90
29.45
29.30
29.10
28.77
28.21
Balloon 3
Circumference
(cm)
30.20
31.80
33.02
33.69
34.48
35.10
34.80
34.42
33.97
33.08
Circumference Measurements
Time
(min)
2:00
4:00
6:00
8:00
10:00
12:00
14:00
16:00
18:00
20:00
Balloon 1
Circumference
(cm)
22.17
23.39
24.64
25.40
26.30
26.00
25.45
24.98
24.03
23.74
Balloon 2
Circumference
(cm)
25.51
26.93
27.68
28.03
28.88
29.55
29.02
28.75
28.05
27.63
Balloon 3
Circumference
(cm)
30.18
31.47
32.98
33.55
34.20
34.95
34.20
33.84
33.01
32.66
Notes for Post-Lab Calculations:
*Note: Answers from each box within a column will be used for future calculations within
the column (for the same balloon). You must round your answer for that box to the correct
significant figures. When using the answer from a previous box, use the rounded answer.
All boxes must have work shown, and all answers must be in significant figures and include
a unit.
Box 1:
Choose the largest circumference for each balloon from your data table and place in the
first box of your data table for calculations.
Box 2:
Plug your number from the first box into the equation (r=c/2π). You must use the π button
on your calculator. Significant figures will be based on the number you plugged in for “c”.
Box 3:
Plug your number from box 2 into the equation (4πr3/3). You must use the π button on
your calculator. Significant figures will be based on the number you plugged in for “r”.
Your answer’s unit will be cm3. It must be changed into liters. Hint: 1cm3 = 1mL
Box 4:
Use the ideal gas law. Pressure used will be standard. Volume will be the answer from the
above box. Temperature is 23.5C. Solve. Significant figures will be based on the
numbers you plug into your equation.
Box 5:
Take your answer from the above box and convert to mass (using conversion factors/Ch.
12 calculations). Significant figures will be based on your starting number.
Box 6:
1. Find the moles of tablet(s) from grams. You will have 1 tablet for the first column, 2
tablets for the second column, and 3 tablets for the third column.
1 tablet = 1916 mg. You must convert mg to g. Once in grams, convert from
grams of NaHCO3 to moles of CO2. (use below as an example word problem)
2NaHCO3 (s) + H2O (l) ---> Na2CO3 (aq) + CO2 (g) + 2H2O (l)
If one Alka-Seltzer tablet (regular strength) contains 1916 mg NaHCO3, how many
L CO2 will be produced under conditions of excess water, 101.3 kPa and 23.5ºC?
(Significant figures will be based on the above information)
2. Plug your answer from #1 (above) and other information in the word problem into
the ideal gas law equation to solve for volume. Your answer (volume) is the
“theoretical volume” for BOX 6. Significant figures are based on the numbers you
plug into the ideal gas law equation.
Box 7:
Use Percent error equation: |A – E| / A x 100
A = theoretical
E = experimental
Significant figures will be based on the numbers you plug in for A & E.