Egg Lab Report 3

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Microbiology
Osmosis Lab Report
Lab Experiment 9
Osmosis

Introduction
Kinetic energy is present in cells and its this energy that causes the cells to move. Diffusion causes cells to move from a higher concentration to a lower concentration. Osmosis is a diffusion that allows movement of water through a selectively permeable membrane. Osmosis occurs until it reaches equilibrium, or when the concentration on each side is the same. This is called an isotonic solution. A solution with differing concentrations is hypertonic on the side that is higher in concentration, and hypotonic on the lower concentration. The purpose of this experiment is to show the effects of osmosis on the de-shelled egg. I hypothesize that the egg will increase in size in the vinegar and shrink in the syrup, staying relatively the same size in the water. Methods:

Fresh boiled and shelled eggs is used in this experiment. The eggs were soaked in vinegar for up to 48 hours and no less than 24. At the end of this period the eggs are dried off and mass is recorded. The eggs are then placed in distilled water. They are removed and the mass recorded. Lastly the eggs are put into corn syrup and again removed and the mass recorded.

Results:
The egg in the vinegar got bigger, as the fluid moved into the egg, and the fluid level went down. This is an example of a hypertonic solution. In the distilled water the egg got slightly larger, but not as much as in the vinegar, as only a small amount of water moved into the egg; a more isotonic environment. After being in the syrup, the egg became smaller as the water moved out of the egg and into the syrup molecules. This is a hypotonic environment.

Interpretation:
The egg swelled in the vinegar because of diffusion. The vinegar moved into the egg which caused the egg to swell, as the egg was in a hypertonic solution. The egg that was placed into the distilled water swelled only slightly as the concentration of solvent in the egg was lower...
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