Potato Osmosis Lab PDF

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Potato Lab...

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In this experiment, we used a glucose solution made up of different concentrations of our solute, glucose, solvent, distilled water, and a small piece of potato. We let the potato soak in the varying glucose concentrations. This allowed us to determine which solutions caused the potato’s cytoplasm to become isotonic, remain the same with not water entering or exiting the potato, hypertonic, water exiting the potato causing it to become shriveled up, or hypotonic, watering entering the potato causing it to swell. Before the potatoes were placed in the solutions, we measured their initial weight. After they soaked in the solution for a while, we measured their final weight. We will perform these steps twice to help prevent variability of the results. My hypothesis for this experiment was if a potato is in a glucose solution with a higher M of glucose, then the potato’s cytoplasm will become hypertonic and become shriveled up. If a potato is in a glucose solution with a lower M of glucose, then the potato’s cytoplasm will become hypotonic and the potato will become swollen. First I prepared the 10 solutions of glucose and distilled water. For example, I did 10 mL of water 0 mL of glucose. 9 mL of water, 1 mL of glucose. Then, I took 20 pieces of potatoes (2 per solution) using a cork borer. Next, I took the mass of each of the pieces of potatoes and recorded them, making sure I knew what solution each piece was going into. After an hour, I removed each piece from the solutions and weighed them again. The final step was to calculate the percent change for each of the pieces to determine which pieces in which solutions remained isotonic....