Osmosis Lab

1809 Words Nov 5th, 2011 8 Pages
Osmosis of Sucrose Solutions of Different Molarities Through Dialysis Tubing (a Semi-Permeable Membrane)

I. DESIGN A. PROBLEM/RESEARCH QUESTION 1. How does increasing molarity of sucrose affect osmosis through dialysis tubing?

B. VARIABLES 1. The independent variable in this lab is the molarity of sucrose each dialysis bag is filled with. The time (30 minutes), the temperature (23C) and the type of dialysis tubing used are all constants. 2. The dependent variable is the final mass of the dialysis bag. 3. The control in the experiment is distilled water, as it does not contain sucrose solution. C. MATERIALS NEEDED 4. Five 30 cm strips of dialysis tubing 5. Five
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The greater the percent change, the more mass is gained. The control group, distilled water, also shows an increase in percent change. This demonstrates that even with the absence of sucrose, osmosis would take place.

G. Sucrose Solutions of Different Molarities Percent Change in Mass after 30 minutes of Submersion in Water
The molarity of the solutions in each dialysis bag, and the percent change in mass are both included to best show effect of increasing molarities of sucrose and osmosis. The percent change in mass exhibits the process of osmosis, because osmosis must take place for water molecules to transfer from one side of the semi-permeable (in the surrounding distilled cup) to another (within the dialysis tubing), in order to reach equilibrium.

A linear line of best fit (calculated by the Microsoft Excel Program with the entered points) is included in the graph to show the increasing trend of percent change along with the increasing molarities of sucrose solutions.

III. CONCLUSION

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