Lab 6 Alka Seltzer Strength_Spring2024
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Spring 2024
Lab 6 Assignment: Alka Seltzer Strength
Be sure to report all data and calculated results with the correct number of significant figures. Record all digits when making measurements. Follow the rules for significant figures
, and remember that the rules for addition and subtraction differ from the rules from multiplication and division.
Part 1: Determining the Nature of the Reaction
1. Based on the Background information, what product of the reaction causes the bubbling to occur when Alka-Seltzer is added to the vinegar?
The product of the reaction causing the bubbles is the carbon dioxide gas or CO2.
2. Based on the Background information, what component of Alka-Seltzer reacts with the acid in the vinegar? Write its name and chemical formula.
Sodium Bicarbonate – NaHCO3
3. Use the Background information and Chapter 4 in your textbook as a reference to write a balanced equation (including physical states) for the reaction you observed when you added sodium bicarbonate to the acid in vinegar, acetic acid, HC
2
H
3
O
2
(
aq
). NaHCO3(s)+HC2H3O2(aq)→H2O(l)+CO2(g)+NaC2H3O2(aq)
4. Explain why the other components of Alka-Seltzer (described in the Background) should not react with acetic acid in vinegar to product a gas.
The other components of Alka-Seltzer don’t have the necessary components to participate in the acid-
base neutralization reaction therefor they don’t react with anything in the reaction.
Page 1
of 7
Name: Cody Kaiser
Date: 4/18/24
5. Fill in the table below with your recorded data and calculated results for Part 1.
BEAKER Column (1)
Initial Mass
(g)
Column (2)
Final Mass
(g)
Column (3)
Mass CO
2
evolved (g)
Column (4)
Moles
CO
2
evolved
(mols)
#
Mass of beaker & solution (g)
Mass of Alka-
Seltzer (g)
1
67.089g
2.000g
69.089g
68.500g
.589g
.0134 moles
Column 1: This initial mass
(before reaction) is the measured mass of the beaker containing the vinegar solution PLUS the mass of the Alka-Seltzer tablet (2.000 g). Column 2: This final mass
is the measured mass of the beaker with its solution after the reaction between the Alka-Seltzer with the vinegar. Column 3: Calculate the mass of CO
2
evolved in each beaker by subtracting the final mass from the initial mass.
Show calculation for Beaker #1 here.
69.089g-68.500g = .589g
Column 4: Convert the mass of CO
2
evolved (column 3) to moles of CO
2
evolved. When determining molar mass of CO
2
, be sure to use at least four significant figures in your molar mass values obtained from the periodic table. For Beaker #1, write the value for mass of CO
2
evolved and show your calculation here.
.589g / (44g/mol) = .0134 mols
6. Which of the following statements is true? Circle or highlight your choice.
A.
The moles of the CO
2
gas evolved should be equal to the moles of the NaHCO
3
(in the Alka-
Seltzer tablet) that reacted.
B.
The mass of the CO
2
gas evolved should be equal to the mass of the Alka-Seltzer tablet.
C.
The moles of the CO
2
gas evolved should be less than the moles of the NaHCO
3
(in the Alka-
Seltzer tablet) that reacted.
D.
The mass of the CO
2
gas evolved should be equal to the mass of the NaHCO
3
in the Alka-Seltzer tablet.
Page 2
of 7
Part 2: Determining the Percent-By-Mass NaHCO3 in Alka-Seltzer
Be sure to report all data and calculated results with the correct number of significant figures. Record all digits when making measurements. Follow the rules for significant figures
, and remember that the rules for addition and subtraction differ from the rules from multiplication and division.
7. Fill in the table below with your recorded data and calculated results. More descriptive instructions for each column are below the chart. For some of the columns you’ll need to show a sample calculation.
BEAKER
#
Column (1)
Initial Mass
(g)
Column (2)
Final Mass
(g)
Column (3)
mass CO
2
evolved (g)
Column (4)
moles CO
2
evolved (mols)
Column (5)
moles of
NaHCO
3
reacted (mols)
Column (6)
mass of
NaHCO
3
reacted (g)
1
65g
64.239g
.761g
.0173 mols
.0173 mols
1.453g
2
65.005g
64.171g
.834g
.0190 mols
.0190 mols
1.596g
3
65.010g
64.127g
.883g
.0200 mols
.0200 mols
1.681g
4
65.015g
64.132g
.883g
.0200 mols
.0200 mols
1.681g
5
65.020g
64.137g
.883g
.0200 mols
.0200 mols
1.681g
6
65.026g
64.172g
.854g
.0194 mols
.0194 mols
1.630g
Column 1: This initial mass
(before reaction) is the measured mass of the beaker containing the water and vinegar PLUS the mass of the Alka-Seltzer tablet (3.000 g). Column 2: This final mass
is the measured mass of each beaker with its solution after the reaction
between the Alka-Seltzer with the vinegar and water. Column 3: Calculate the mass of CO
2
evolved in each beaker by subtracting the final mass from the initial mass.
Show calculation for Beaker #6 here.
65.026g – 64.172g = .854g
Column 4: Calculate the number of moles of CO
2
evolved in each beaker. (Remember to use molar mass
with at least four significant figures in your calculation.) Write the value and show calculation for Beaker #6 here.
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of 7
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.854g / 44.01 g/mol = .0194 mols
Column 5: Calculate the number of moles of NaHCO
3
that reacted in each beaker. Write the value and show calculation (or explain your answer) for Beaker #6 here.
The number of moles of NaHCO3 consumed is the same number of moles of CO2 evolved since
that is the product of the reaction. .0194 moles.
Column 6: Calculate the mass of NaHCO
3
that was used up in the reaction for each beaker. (Remember to use molar mass
with at least four significant figures in your calculation.) Write the
value and show calculation for Beaker #6 here.
.0194 moles * 84.007 g/mol = 1.6297358 or 1.630 g of NaHCO3
8. Create a graph with six data points by plotting the mass of reacted NaHCO
3
in each beaker (y-axis) against the volume of vinegar (x-axis). Include distinct data points on the graph.
0
2
4
6
8
10
1.3
1.35
1.4
1.45
1.5
1.55
1.6
1.65
1.7
1.75
Volume of Vinegar (mL)
Mass of Reacted NaHCO3 (g)
Page 4
of 7
9. Use the graph of your results to answer the following questions:
(a) Which trials (beaker numbers) can you use to calculate the amount of NaHCO
3
that reacted
?
1,2
(b) In which trials (beaker numbers) was NaHCO
3
the limiting reactant
? 3,4,5,6
(c) Which trials (beaker numbers) can you use to calculate the amount of NaHCO
3
present in the Alka-Seltzer samples?
3,4,5,6
(d) What is the mass of NaHCO
3
in each of the Alka-Seltzer “tablets” used in this lab? Explain how you arrived at your result.
(e) What is the percent-by-mass composition of NaHCO
3
in the Alka-Seltzer tablet? Write the value and show your calculation here.
Continued…
Page 5
of 7
10. As noted in the background to the lab, each Alka-Seltzer tablet contains acids such as aspirin (acetyl salicylic acid) and citric acid. These are the only acids that react with the NaHCO
3
in the tablet in Trial 1
of Part 2
when no vinegar was added.
(a) How many moles of NaHCO
3
reacted in Trial 1? .0173 mols
(b) How many moles of H
+
(from aspirin and citric acid) reacted
with NaHCO
3
in Trial 1. The net
ionic equation is: NaHCO
3
(
s
) + H
+
(
aq
)
Na
+
(
aq
) + H
2
O(
l
) + CO
2
(
g
)
(c) Assume that the number of moles of NaHCO
3
that reacted in Trial 1 were not available to react
with the vinegar added in later trials. In Table 7 (Column 5), you determined moles of NaHCO
3
that reacted in each trial, which is the moles of NaHCO
3
that reacted in each tablet. Specifically for Trial 6, determine the number of moles of NaHCO
3
in the tablet that are available
in each tablet to neutralize stomach acid (HCl) when taken as an antacid. Write the value with units and show your calculation here
.
(d) Convert moles of available
NaHCO
3
per tablet you calculated in10(c) to units of grams
/tablet.
Write the value with units and show your calculation here
.
11. Use your answer to 10(d) to calculate the
percent-by-mass composition of NaHCO
3
available
to neutralize stomach acid in each tablet.
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//www.laurel.kyschools.us/userfiles/1012/Classes/65686/5.pdf?id-69487
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