Data Sheet
Name_____________________________
1. Determine the molar mass of sodium bicarbonate (from periodic table).
molar mass of Na
_______________
x 1 mol Na = _______________
molar mass of H
_______________
x 1 mol H = _______________
molar mass of C
_______________
x 1 mol C = _______________
molar mass of O
_______________
x 3 mol O = _______________
Sum for total molar mass
_______________
2. Determine the number of moles of sodium bicarbonate in your sample of baking soda:
Run I
grams of sodium bicarbonate (from experiment):
molar mass of sodium bicarbonate (from #1 above)
number of moles of sodium bicarbonate
_______________
_______________
_________________
Run II
grams of sodium bicarbonate (from experiment):
molar mass of sodium bicarbonate (from #1 above)
number of moles of sodium bicarbonate
_______________
_______________
_________________
Run III (which was optional)
grams of sodium bicarbonate (from experiment):
molar mass of sodium bicarbonate (from #1 above)
number of moles of sodium bicarbonate
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_______________
_______________
_________________
Copyright © 2000 by Doris Kimbrough, all rights reserved Page 1 of 4
3. Determine the mass of acetic used in the experiment. If your vinegar is 4 %, this
means that every 100 g of vinegar contains 4 g of acetic acid. (If it is 5 %, then 100 g
contains 5 g of acetic acid).
Run I:
4 grams acetic acid
? grams acetic acid

100 grams of vinegar
______ grams of vinegar
This is the mass of
vinegar you measured
in the 1st experiment.
Run II:
4 grams acetic acid
? grams acetic acid

100 grams of vinegar
________ grams of vinegar
This is the mass of
vinegar you measured
in the 2nd experiment.
Run III:
4 grams acetic acid
? grams acetic acid

100 grams of vinegar
_______ grams of vinegar
4. Determine the molar mass of acetic acid, C3H4O2.
molar mass of C
_______________
x 3 mol C = _______________
molar mass of H
_______________
x 4 mol H = _______________
molar mass of O
_______________
x 2 mol O = _______________
Sum for total molar mass
_______________
5. Determine the number of moles of acetic acid in each sample of vinegar.
Run I
grams of acetic acid (from #3 above):
_______________
molar mass of acetic acid (from #4 above)
_______________
number of moles of acetic acid
_________________
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Run II
grams of acetic acid (from #3 above):
_______________
molar mass of acetic acid (from #4 above)
_______________
number of moles of acetic acid
_________________
Run III (which was optional)
grams of acetic acid (from #3 above):
_______________
molar mass of acetic acid (from #4 above)
_______________
number of moles of acetic acid
_________________
6. Determine the total mass gain or loss for the reaction by comparing your initial mass
(combined mass of baking soda and vinegar) to your final mass.
Run I:
Initial total mass
Run II:
__________
Run III:
Initial total mass __________
Initial total mass
Final total mass __________
Final total mass
Difference
Difference
__________
Final total mass
__________
__________
Difference
__________
__________
__________
7. Calculate the molar mass of carbon dioxide.
molar mass of C _______________
x 1 mol C =
_______________
molar mass of O _______________
x 2 mol O =
_______________
Sum for total molar mass _______________
8. Determine the number of grams of carbon dioxide that the reaction should theoretically
produce, remembering that one mole of acetic acid or sodium bicarbonate should produce
one mole of carbon dioxide
Run I:
moles of carbon dioxide*
__________
molar mass of carbon dioxide (from #7)
X__________
grams of carbon dioxide (the product)
___________
Run II: moles of carbon dioxide*
__________
molar mass of carbon dioxide (from #7)
X__________
grams of carbon dioxide (the product)
___________
Run III: moles of carbon dioxide*
__________
molar mass of carbon dioxide (from #7)
X__________
grams of carbon dioxide (the product)
___________
*moles of carbon dioxide = moles of acetic acid (from #5 above)
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Copyright © 2000 by Doris Kimbrough, all rights reserved Page 3 of 4
Questions (attach answers)
1. Figure out why the mass increased or decreased. Correlate this increase or
decrease to the products yielded by the reaction. Does the stoichiometry of the
reaction (coupled with the results of the calculations above) account for all of the
mass difference? Discuss possible reasons for any discrepancies.
2. In this particular example the change in mass through the course of the reaction
provides evidence that a reaction is taking place. Is it necessary to have a change
in mass in order to have a reaction? Can you provide an example of a reaction
where no mass change would be observed?
3. (Extra credit) Explain how this particular reaction might be supportive of the
phlogiston theory that was popular among scie
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