Determining Molarity lab
Background:
Osmosis is the diffusion of water across a semipermeable membrane. Osmosis occurs in the cell of living things. A way that we can use osmosis is to determine the molarity of substances. Dialysis tubing acts as a semipermeable membrane and can recreate osmosis in action.
Purpose: The purpose of this experiment is to determine which solution has the most similar molarity to a solution with an unknown molarity.
Hypothesis: The solution that has the most similar molarity to the mystery solution will have the least chance in mass because there will be less osmosis occurring.
Materials:
- 4 beakers
- 4 pieces of dialysis tubing
- 150 ml of each colored solution
- 40 ml of the mystery solution
- balance
- graduated cylinder
Procedure:
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Iv: molarity of the colored solution
Dv: change in mass of the dialysis tubing
Control group: n/a
Constants: amount of colored solution, amount of mystery solution, time in solution
Measurment: balance
Results:
Masses of bags of Mystery Solution
Mass in grams
Mass Before
Mass After
Change in Mass
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Dark Blue
9.6
8.5
1.1
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Light Blue
10.9
10.7
0.2
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Dark Yellow
9.4
9.5
0.1
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Light yellow
11.0
10.4
0.6
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