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# What results when concentrations of diverging concentration levels on a model cell are submerged in water?

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Introduction

Osmosis Lab Question: What results when concentrations of diverging concentration levels on a model cell are submerged in water? Hypothesis: In an experiment where dialysis tubing is applied to simulate the plasma membrane of cells and demonstrate osmosis, a model cell including the highest level of concentration of sucrose will ultimately have a higher impact on the mass than one including sucrose of a lower concentration. Variables: Independent variable: the level of concentration of sucrose in the solute Dependent variable: movement of water molecules during the simulated osmosis, or the change in mass Controlled variable: amount of solute placed in dialysis tubing segments Data Collection: Data Table #1: Mixing Concentrations Solute concentration (%) ...read more.

Middle

Group 1 Group 2 Group 3 Group 4 Group 5 Average % change in mass 0.0 21.0 1.40 0.19 1.71 1.45 4.29 0.2 29.4 6.70 11.0 4.43 4.40 9.36 0.4 28.1 8.30 13.3 10.6 9.04 11.6 0.6 36.7 19.7 23.4 12.2 10.7 17.2 0.8 36.0 17.5 23.8 20.2 19.6 19.7 1.0 36.8 20.6 35.5 23.7 13.7 21.9 Data Processing/Presentation: Graph#1: Class Average (% Change in Mass) Graph 1 (above) shows the relationship between change in mass and concentration level. Conclusion: Osmosis is the passive movement of water molecules, across a semi permeable membrane, from a region of lower solute concentration to a region of higher solute concentration. It differs from simple diffusion in that it has limits. ...read more.

Conclusion

The process was observed in each tube segment, as there was a mass change in each of them, which shows that another substance must have been added to account for this change. Following the data recording of each segment's mass, this number needed to be converted to a percentage so that a comparative change could be observed. Without completing this crucial step, this would not be easy to see, as there were different concentrations, and the change should be in relation to the sample number. Some real-world applications of this process include kidney dialysis, which relies on osmosis in order to work, plants passing water from their roots to their leaves, which uses osmotic potential to draw water upward rather than flowing with gravity. Osmosis is an important process to everyday life. ?? ?? ?? ?? ...read more.

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