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Law of Conservation of Mass Lab

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: • balance • 1 balloon • weighing paper • 50 mL flask • 50ml graduated cylinder • ~5 g baking soda • ~15 mL vinegar

Introduction: The word equation for the following reaction is as follows: vinegar + baking soda → sodium acetate + water + carbon dioxide The chemical equation for the reaction is: CH3COOH + NaHCO3 → NaC2H3O2 + H2O + CO2 Reactants Products

Procedure: 1. Record the mass of the empty flask and the balloon. 2. Pour about 15 mL of vinegar into the flask. Weight the flask & vinegar, subtract the flask weight to find the weight of your vinegar. 3. Put about 5g of baking soda into the balloon, make sure you weight the empty balloon first so you know exactly how much baking soda was put in. Record the exact mass of baking soda that is in the balloon. 4. While one student holds the flask, another must slip the open end of the balloon over the mouth of the flask, while keeping the baking soda from entering the flask. 5. Weight the whole system and record the mass. 6. Tip the balloon upright, allowing the baking soda to drop into the flask and allow the reaction to fully complete. Measure and record the mass of the products/container/balloon 7. Swirl your reaction a little bit to make sure all of the baking soda reacted 8. After the reaction is completed, weight the mass of the balloon, flask, baking soda and vinegar (Do not let any gas escape from the system that you set up) 9. Open the balloon to let the gas escape and reweight the system. Record 10. Return the empty balloon to me and rinse everything down the drain.

Step 4 Step 6
Data:

|Material |Mass (g) | |
| | |8.Total mass of all objects after the reaction occurred |
| | | |
| | |-------------------------------------- gram |
|Flask | | |
|Balloon | |Compare the mass of your all your objects before the reaction and after the |
| | |reaction. Are they the same? |
| | | |
| | |____________________________________ |
|Vinegar | | |
|Baking soda | |9. Mass of the system after the Carbon dioxide gas escaped._____________ |
|Total Mass of all objects | | |

Analysis Questions:
1. What evidence was there to indicate that a chemical reaction occurred?

2. How did the final (products) mass of the system compare with the initial (reactants) mass of the system for each trial? How did your result support or violated the Law of Conservation of Mass?

3. List the reactants and indicate its state of matter

4. List the products and list its state of matter

5. How else could you have tested the law of conservation of matter for this reaction? What other experimental designs could you have implemented? Write a different procedure that can be used to test this law.

6. Was this experiment an open or closed system?

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