Meniscus and Displacement Lab

Name: __________________
Name: __________________

Problem: How much liquid is displaced when baking soda is added to a container of vinegar? How much mass is lost when baking soda is added to vinegar?

Background information:

Define and illustrate meniscus.

Define and illustrate displacement.

Define Acid:

Define Base:

Define Conservation of Mass:

Hypothesis:

Materials: Beaker, graduated cylinder, baking soda, vinegar

Procedure:

1. Measure 50 mL of vinegar in a graduated cylinder.
2. Draw the meniscus.
3. Measure the mass of an empty 250 mL beaker. Record.
4. Pour the vinegar into a 250 mL beaker.
5. Repeat steps 1 and 2, then pour the vinegar into the beaker.
6. Record volume and mass.
7. Draw the meniscus.
8. Obtain a teaspoon of baking soda and measure the mass. Record.
9. Gently place the baking soda in the beaker of vinegar.
10. Record the new volume of the contents of the beaker.
11. Determine the displacement of vinegar in the beaker. Record.
12. Measure the mass of the beaker containing the vinegar and baking soda. Record.
13. Measure the mass of an empty 50mL graduated cylinder. Record.
14. Measure 40 mL of vinegar in a graduated cylinder.
15. Draw the meniscus of the graduated cylinder.
16. Measure the mass of one teaspoon of baking soda. Record.
17. Gently place the baking soda in the graduated cylinder of vinegar.
18. Record the new volume.
19. Record the new mass.
20. Repeat steps 14 through 19 with 20 mL of vinegar.
21. Clean table and equipment. Return clean materials to cart.

Data:

Trial Number123
Initial Mass of Beaker (g)
Init. Mass of Graduated Cylinder (g)
Volume of Vinegar (mL)
Mass of vinegar and beaker/graduate cylinder (g)
Mass of baking soda (g)
Mass of vinegar, baking soda and beaker/grad. cyl (g)
Volume of vinegar and baking soda (mL)
Displacement (mL)

Illustrations:

1. How did the amount of displacement vary with the initial volume of vinegar?
2. How did the mass of the beaker, vinegar, and baking soda vary with each trial?

Conclusion:

1. Was your hypothesis supported? Why or why not?

2. Was the mass of the system conserved (the mass of the beaker and vinegar + the mass of the baking soda = the final mass)? Explain.

3. What sources of error did you have?

4. If the mass was not conserved, what happened to it?

Reflection:

Part 2: How can you conserve the mass of the system?

Develop a procedure to measure the volume and mass of vinegar and baking soda before and after reacting with each other. How can you be sure to conserve the mass? Show your teacher your proposed procedure before gathering materials.
Materials:

Procedure:

Data:

Trial1 2 3
Mass of container (g)
Mass of container and vinegar (g)
Mass of baking soda (g)
Mass of system after reaction (g)
Difference in mass before and after (g)

Analysis:  Explain in words what your data shows

Conclusion:

1. Was your hypothesis supported? Why or why not?
2. Was the mass of the system conserved? Explain.
3. What sources of error did you have?
4. If the mass was not conserved, what happened to it?

Reflection:

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