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Cultural Studies

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Laboratory Exercise
Osmosis and Diffusion

“Osmosis and the Incredible, very Inedible Egg”

**This is a fun thing to have your kids or significant other help with. Please note that this experiment takes several days to complete, so don't wait until the last minute to start!**

I. Background: Osmosis is the diffusion of water molecules through a semi-permeable membrane. This is how water gets into and out of our cells. In this lab we will investigate the effects of different solutions on the water content of an egg. An egg will serve as our model of a cell.

A. Remember, when comparing 2 solutions, the one with the greatest amount of stuff dissolved in it is called hypertonic while the one with the lesser amount of stuff dissolved in it is called hypotonic. Please get these terms straight in your mind before you start the experiment.

B. Therefore, hypertonic solutions have less percentage of water in them than hypotonic solutions. Water, like everything else, moves from a greater concentration of itself to a lesser concentration of itself.

C. In this experiment you will observe the movement of water into and out of an egg. To do this we will remove the minerals from the egg shell leaving only a membrane that is permeable to water.

II. Supplies needed: 3 eggs 4 drinking glasses or clear containers Vinegar (about 2 cups) Foil or plastic wrap White Karo syrup (or any brand like it) Distilled water (actually tap water will work too)

III. OSMOSIS and DIFFUSION Procedures

1. Place the eggs into a container and cover them with vinegar. Cover the container with foil or plastic wrap and set it in the fridge for 3 days. The vinegar is an acid and it will dissolve the minerals of the shell so that the eggs will become very soft, so handle carefully (you really only need

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