The Elk

Observing Osmosis in Action

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Last week, students in Mrs. Brimage’s biology class conducted an experiment to increase and decrease their eggs’ mass. Before the experiment, Mrs. Brimage dissolved the shell from each egg. For their safety and sanitation, they wore latex gloves, safety glasses, and aprons. There were two students in each group and they had to closely monitor the mass of each of their eggs. In the experiment, each group was given two cups; one with water and one with syrup. After every seven minutes of having the eggs in the cups, the students would take them out, dry them off, weigh them, and then calculate the mass change percentage. The feeling of the syrup egg after the experiment was a kind of squishy feel, and the water egg felt more full and bouncy. Mrs. Brimage said, “The experiment’s purpose was to observe osmosis. The outcome should have been the egg placed in syrup would lose mass because the water moved from the egg to the syrup. Representing that water moves down a concentration gradient or from hypotonic to hypertonic. The egg placed in pure water gained mass because again the water moved from the hypotonic solution to the hypertonic.”

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Observing Osmosis in Action