Reaction of Acetic Acid with Baking Soda
Mole Ratio Lab
NAME ____________________________
Purpose: To determine the molar ratios of the components of the chemical reaction which occurs
when acetic acid (vinegar) is added to sodium hydrogen carbonate (baking soda).
_____ NaHCO3 (s)
+
Materials:
Electronic balance
1 x 25 ml beaker
1 plastic petrie dish
____ H+ (aq) 
_____ H2O (l)
+
scoopula
baking soda in plastic cup
2 x pipets
____ CO2 (g)
+
____ Na+ (aq)
Acetic Acid (Vinegar)
Paper Towels
Procedure:
1. Record the mass of the top section of the petrie dish.
Leave the dish on the balance.
2. Using a scoopula, place 0.70 – 0.75 g of baking soda in the dish on the balance. Record the mass again.
3. Take the dish off the balance. Zero the balance. Replace the dish and record the mass again.
4. Record the mass of the dry beaker. Take the beaker off the balance. Zero the balance. Replace the
beacker on the balance and record the mass again.
5. With two pipets + a dry beaker in hand, come to the front of the class. Depress the pipet bulbs
completely, submerge the pipets in the acid, then fill the pipets with acid.
6. Place the pipets upside down (bulb side down) in the beaker. Record the mass of the filled pipets +
beaker. Take the beaker off the balance. Zero the balance. Remass the beaker+pipets again.
7. SLOWLY add drops of acid from the filled pipets onto the baking soda in the petrie dish. Make sure that
the reaction does not bubble out of the dish.
8. Continue to add acid until all the acid from both pipets is in the dish.
9. Place the empty pipets back into the dry beaker. Record the mass of the beaker +empty pipets twice.
10. Fill in the data table and complete the simple calculations while you wait for the reaction to finish.
11. Once all bubbles have disappeared, mass the petrie dish and the reaction mixture twice and record the
data.
12. Rinse the dish to clean and put upside down on a paper towel.
Data Table:
First Mass
(g)
Mass of Petrie Dish Top
Mass of Petrie Dish Top + Baking Soda
Mass of Empty Beaker
Mass of beaker + FULL pipets
Mass of dish+vinegar+baking soda
AFTER REACTION is OVER
= Reaction Mixture
Mass of beaker + EMPTY pipets
Analysis+Calculations:
1. Average mass of baking soda = ______________ g
2. Average mass of acetic acid (vinegar) only = ___________g
3. Average mass of reaction mixture = __________g
Second Mass
(g)
Average Mass
(g)
4. Calculate the molar mass of Baking Soda, Acetic Acid, and Carbon Dioxide below.
Chemical Formula
Molar Mass
Scratch Work
Baking Soda
Acetic Acid
Carbon Dioxide
5. Using your answer from #1 and the molar mass, calculate the moles of baking soda.
= ________ mol of baking soda
6. Calculate the mass of carbon dioxide gas lost during the reaction.
(total reaction mixture before – total reaction mixture after) = mass of carbon dioxide lost
= __________ g of CO2 lost
7. Use your answer from #6 and the molar mass to calculate the moles of carbon dioxide lost.
= __________ mol of CO2 lost
8. Find the mole ratio:
Moles of CO2 lost
=
Moles of Baking Soda reacted
___________ =
9. Balance the chemical reactions below.
a. _____ NaHCO3 (s) + ____ H+ (aq)  ____ H 2CO3 (aq) + ____ CO2 (g) + ___ Na+ (aq) + ___ H2O (l)
b. _____ NaHCO3 (s) + ____ H+ (aq)  _____ H2O (l)
+ ____ CO2 (g) + ____ Na+ (aq)
c. _____ NaHCO3 (s) + ____ H+ (aq)  _____ H2O (l) + ____ CO (g) + ____ O2 (g) + ____ Na+ (aq)
10. Using the balanced equations from above, find the mole ratio of CO2 to NaHCO3 for each.
a.
Moles of CO2 =
Moles of NaHCO3
b.
Moles of CO2 =
Moles of NaHCO3
c.
Moles of CO2 =
Moles of NaHCO3
Conclusion:
Which reaction above (a, b, or c) occurred in your petrie dish? _____ Defend your answer.