Osmosis Lab (Conclusion)

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Osmosis Lab: Conclusion Andrea Joseph To test the property of osmosis, I put an egg in a jar with liquid to see if the liquid would move in or out of the egg, and therefore change the egg’s mass. My hypothesis was that the type of liquid in an egg is put into will affect the mass of the egg. This hypothesis was further explained by my prediction, “The mass of my egg will be greater than what it originally was when placed in approximately 240 ml tap water.” Both of these were proved correct by my experiment. On the first day, my egg weighed 56.04 grams, and was placed in vinegar. After four days, the egg was visibly larger than it was originally, it felt like a heavy water balloon, and the shell had disappeared and left a gold membrane with white residue behind. The egg weighed 82.57 grams and was placed in 240 ml of tap water for two days. On the last day, the egg looked exactly like before except there was less white residue and it felt a little fuller of water. The egg weighed 83.48 grams, with 234 ml of tap water remaining in the jar. Based on the last two day’s measurements, I know that some water (6 ml) has moved into the egg, and I can infer that this happened because the concentration of water inside the egg was less than outside the egg. The aquaporins in the egg’s cell membrane let some tap water from its surroundings in, so that the concentrations of water would be the same inside and outside the cell, resulting in equilibrium. This is demonstrated in other similar experiments that were also conducted: when placed in a 5% salt water solution, the egg grew 0.68 grams, and 8 ml of the solution moved into the egg, which likely balanced the water concentrations inside and outside of the egg. When placed in 100 ml of oil, the egg shrank 6.07 grams and left 101 ml of liquid in the jar. Similarly, when placed in corn syrup, the egg shrank 42.03 grams and left

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