Law of Conservation of Mass Lab



Lab #4: Law of Conservation of MassName:PROCEDUREPeriod:Date:Purpose: To attempt to verify & observe the Law of Conservation of Mass - In any chemical reaction, the total mass of the reactants is always equal to the mass of the products. Materials: balancebeaker1 balloon w/baking soda~15 g baking soda~50 mL vinegar100 mL graduated cylinderPre–Lab Questions: (phrase question in answer)1. What happens when you combine baking soda and vinegar?2. What does “to conserve” mean?3. What is the Law of Conservation of Mass?Introduction: The word equation for the following reaction is as follows:vinegar + baking soda sodium acetate + water + carbon dioxideThe chemical equation for the reaction is:CH3COOH + NaHCO3 NaC2H3O2 + H2O + CO2Procedure:Measure 40mL of vinegar using a graduated cylinder.Pour the 40mL of vinegar from the graduated cylinder into an Erlenmeyer flask.Take the mass of the graduated cylinder with the vinegar AND the mass the balloon w/baking soda TOGETHER using the digital scale. Record the mass in the data table as the INITIAL MASS.Fit the balloon onto the Erlenmeyer flask making sure NO baking soda spills into the flask.Once the balloon is on the flask, lift the balloon so the baking soda mixes with the vinegar (see image below). Write your observations on your data sheet.Once the reaction stops, make sure your digital scale reads zero (if not, hit TARE) and take your ENTIRE setup and place it on the digital scale. Record the mass in the data table as the FINAL MASS.Clean-up your station and begin answering the conclusion section.Lab #4: Law of Conservation of MassName:DATA AND RESULTSPeriod:Date:Purpose: To attempt to verify & observe the Law of Conservation of Mass - In any chemical reaction, the total mass of the reactants is always equal to the mass of the products. Data TableInitial Mass(Flask + Balloon = Total)Flask & VinegarBalloon & Baking SodaTotalObservations of ReactionFinal MassError (Final mass – Initial (Total) mass)Show work for calculation of ERROR Below.ANS:Inquiry/Analysis Questions: Please phrase the question in the answer.What evidence was there that a chemical reaction occurred?How did the final mass compare with the initial mass? If the law of conservation of mass was violated, list some reasons why. Indicate the state of matter for each reactant (baking soda and vinegar) and product (sodium acetate, water, and carbon dioxide).What are some ways in which this experiment could be improved? ................
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