1. Title: (2.12) Mass of Mixed Solutions

2. Purpose: To determine if mass change when tow solutions are mixed. Hypothesis: If…then…, because… Materials: (2) Vials Solution A Solution B (2) Pipettes

3. Procedure: 1. With a pipette fill vial A with solution A DONE! 2. With a pipette fill vial B with solution B DONE! 3. Make and record THREE observations of solutions A and B 4. Place both vials containing solution A and B on the balance. 5. Record the mass. 6. Pour solution A into Solution B 7. Make and record the observations of Solution A + Solution B 8. Place vial B with the solution and empty vial A on the balance. DO NOT SPILL ANYTHING!!! 9. Record the mass. 10. Clean up.

4. Data Table Mass of system before mixing_____g Mass of system after mixing_____g Change in Mass_____g Qualitative Data/Observations 1. 2. 3.

5. A Hour Data # Delta mass(g) 1 0.00 2 0.00 3+0.09 4 -.0010 5-0.24 6-.07 7.24 80.00 9-.68

6. B Hour Data # Delta mass(g) 1 +0.05 2 -0.01 3-0.01 4-0.02 5-0.01 6+0.00 7-0.01 8+0.00 9-0.01

7. Research Question Did the mass change as a result of mixing? Why do you think this is the case? Conclusion