Knowing Osmosis Essay

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Esteban Pellot Knowing Osmosis Introduction: Osmosis is the diffusion of water molecules that crosses the semipermeable membrane from a high concentration of water to a low concentration of water. The egg is a good product to demonstrate osmosis. Students can remove the shell of the egg to see how the osmosis works in the cell membrane of the egg, Problem: What happens when a student puts a egg in the solutions hypotonic, hypertonic, and isotonic? Hypothesis: A hypotonic solution will increase the mass of the egg, a hypertonic will decrease the mass of the egg, and a isotonic won’t affect the mass of the egg. Materials: The materials that are included in the lab are four jars, three eggs, water, vinegar, syrup, pencil or pen, paper, markers, and tape. These materials are required for the lab test. Procedure: At Friday, the students had to remove the shells of the egg. Then they put the eggs in distilled water, vinegar and syrup, and waited until Monday to do the other steps. When the students arrived to the classroom, quickly they measured the mass of the eggs, and discussed about the solutions. This is a way to demonstrate osmosis. Experiment: In the experiment, students needed to fill four jars; two with distilled water, one with vinegar, and other one with syrup. One of the jars with distilled water was to remove the shell of the egg; this process had to be done two more times, since the students are using three eggs. Students need to put the eggs, after their shells have been removed, in the corresponding jars and leave them for two days. When they return, they must observe and measure the eggs. They suppose to see that the egg in vinegar should be hypotonic, the egg in syrup should be hypertonic, and the egg in distilled water is isotonic. Both jars with vinegar and syrup are independent variables, and the jar with distilled water is the

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