Name: ______________________
Partner(s):____________________________________
Class M3(01)
Date: ____________
The word equation for this lab’s reaction is:
vinegar + baking soda  sodium acetate + water + carbon dioxide
The chemical equation for the reaction is:
CH3COOH + NaHCO3 NaC2H3O2 + H2O + CO2
Question: What do you observe about the mass of reactants and products when you react baking soda
and vinegar and why do you think this is happening?
Your Prediction (hypothesis): ______________________________________________________________________
____________________________________________________________________________________________________________
____________________________________________________________________________________________________________
Materials:
 weighing scale
 250 mL beaker
 weighing boat
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Ziploc sandwich bag
paper towel
100 mL grad’d cylinder
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baking soda
vinegar
Procedures:
Trial #1
1. Using the scale, weigh 2g of baking soda using weigh boat.
2. Using a graduated cylinder, measure 20 mL of vinegar. Pour vinegar into beaker.
3. Place the beaker with vinegar and the weigh boat with baking soda TOGETHER on the scale.
Measure and record (to the nearest 0.1g) the mass of these reactants plus containers. Record
in the first row of your table under “Initial Mass”.
4. Carefully pour the baking soda into the beaker of vinegar and allow the reaction (fizzing and
bubbling) to complete.
5. Measure and record the mass of the remaining products including containers (to the nearest
0.1g). Record in the first row of your table under “Final Mass”
Trial #2
1. Repeat step 1, measure out 2g of baking soda.
2. Carefully transfer the baking soda to the center of the paper towel and fold the paper towel
into a packet.
3. Using a graduated cylinder, measure 20 mL of vinegar. Pour the vinegar into the bag and seal
it.
4. Place the bag in a beaker and measure the mass of the beaker, bag and baking soda/paper
towel packet. Be careful not to mix the reactants. Record the mass in the first row of Table 2
under “Initial Mass”
5. Unseal the plastic bag. Carefully hold the baking soda packet in the bag ABOVE the vinegar and
below the Ziploc. Seal the Ziploc completely. Then let the packet drop into the vinegar and
gently shake to mix the reactants. KEEP BAG CLOSED!!!!
6. When the reaction has finished, place the bag (including vinegar, paper towel and products),
and beaker back on the scale and measure the mass. Record the “final mass” in the first row of
Table 2.
7. Gather (aggregate) the “change in mass” for trial #1 and trial #2 from the other groups
and record in rows 2-6 of Table 1 and Table 2. Calculate the averages.
8. Clean up all lab equipment, wash glassware and dispose of chemicals according to your
teacher’s instructions.
Results
Data for Trial 1: Baking soda and vinegar reaction in beaker
Initial mass (g)
Final mass (g)
Change in mass (g)
Group
My Group Data
Other Group’s Data
Other Group’s Data
Other Group’s Data
Other Group’s Data
Other Group’s Data
Other Group’s Data
Average
Group
My Group’s Data
Other Group’s Data
Other Group’s Data
Other Group’s Data
Other Group’s Data
Other Group’s Data
Other Group’s Data
Data for Trial 2: Baking soda and vinegar reaction in bag
Initial mass (g)
Final mass (g)
Change in mass (g)
Average
Calculations:
1. Find the change in mass: Initial mass – Final mass
2. Find the average change in mass for all six groups
Conclusion: Write a conclusion paragraph that contains the answers to these questions in complete
sentences. Follow the steps of the Scientific Method as you write. You may write this by hand or on a
computer and attach the paragraph to this lab sheet. Check off the boxes as you answer each
question:
☐Explain the questions for this lab.
☐Write about anything you already knew
☐Share your prediction and explain your reasoning.
☐Briefly summarize the experimental procedures.
☐Share the results of both trials.
☐What conclusions do you draw? For example, do you think a chemical change occurred? Why or
why not? What did you observe about the mass of reactants and products in each trial? How do the
results in the first trial compare to the second? How would you explain this?
7. ☐Evaluate the experiment. Did the evidence support or not support your prediction? Were there any
errors in the experiment? If so, what caused those errors? How might you redesign the experiment
to fix those errors? How might you conduct a different experiment to test your prediction?
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