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C Lab Is Mass Conserved? (15 points possible out of 20) Name:________________________ Class#________________________ Define The Law of Conservation of Mass If we combine baking soda (NaHCO3) and vinegar (C2H4O2 & H2O) one of the products of this chemical reaction is carbon dioxide gas (CO2) According to the law of conservation of mass, we should have the same mass of reactants before and after. We will test this hypothesis now. Hypothesis The mass of reactants before the reaction and mass of reactants after the reaction will be equal. Experiment Items and reactants before experiment Mass of flask Mass of 50 ml of vinegar Mass of balloon Mass of 20 ml of baking soda Sum of all reactants before experiment After Experiment Mass of flask, balloon, and products after experiment (when you dump the baking soda into the flask and les the reaction happen, weigh what is left over.) C Lab (15 points possible out of 20) Is the mass of reactants before the experiment equal to the mass of products after the experiment? Did your results confirm your hypothesis? Why or why not? What do you think would have happened if we hadn’t used a balloon but only weighed the reactants before and after? How would this have affected our results?
