Law of Conservation of Mass Lab



Name: ______________________ Class M3(01)Date: ____________ Partner(s):____________________________________ M3 Science – Chemistry - Baking Soda LabThe word equation for this lab’s reaction is:vinegar + baking soda sodium acetate + water + carbon dioxideThe chemical equation for the reaction is:CH3COOH + NaHCO3 NaC2H3O2 + H2O + CO2Question: 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 scale250 mL beakerweighing boatZiploc sandwich bagpaper towel100 mL grad’d cylinderbaking sodavinegarProcedures:Trial #1 Using the scale, weigh 2g of baking soda using weigh boat. Using a graduated cylinder, measure 20 mL of vinegar. Pour vinegar into beaker.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”.Carefully pour the baking soda into the beaker of vinegar and allow the reaction (fizzing and bubbling) to complete. 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 #2Repeat step 1, measure out 2g of baking soda.Carefully transfer the baking soda to the center of the paper towel and fold the paper towel into a packet.Using a graduated cylinder, measure 20 mL of vinegar. Pour the vinegar into the bag and seal it.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”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!!!!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.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.Clean up all lab equipment, wash glassware and dispose of chemicals according to your teacher’s instructions.ResultsData for Trial 1: Baking soda and vinegar reaction in beakerGroup Initial mass (g)Final mass (g)Change in mass (g)My Group DataOther Group’s DataOther Group’s DataOther Group’s DataOther Group’s DataOther Group’s DataOther Group’s DataAverageData for Trial 2: Baking soda and vinegar reaction in bagGroup Initial mass (g)Final mass (g)Change in mass (g)My Group’s DataOther Group’s DataOther Group’s DataOther Group’s DataOther Group’s DataOther Group’s DataOther Group’s DataAverageCalculations:Find the change in mass: Initial mass – Final massFind the average change in mass for all six groupsConclusion: 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?? 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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