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Osmosis Lab/ Concentrations Of Solutions Effect On Potatoes Mass.

1422 words - 6 pages

"Do different concentrations of solutions determine the mass of a potato?"Introduction:The way to get the full results of this lab was through the process of osmosis. Osmosis is the movement of water across a membrane into a more concentrated solution to reach an equilibrium. When regarding cells osmosis has three different terms that are used to describe their concentration. The first of these words is isotonic. Cells in an isotonic solution show that the water has no net movement and the amount of water that goes in is the same that goes out. Isotonic comes from the root iso, which means equal. This makes sense because the definition of isotonic is: same concentration. The second out of three words is hypotonic. Cells in a hypotonic solution make the water move into the cell to spread out the cells solutes to eventually reach an equillibrium. Hypotonic comes from the root word hypo, which means low/below. The actual definition for hypotonic is: less concentrated. Hypertonic is the last out of the three words. A cell in a hypertonic solution makes the water leave the cell to try to spread out the solutes outside to eventually reach an equillibrium. Hypertonic comes from the root word hyper, which means more/high. The definition of hypertonic is: more concentrated.A plant cell in two out of three of these conditions can be crucial to a plants health. In an isotonic solution, a plant cell has no net movement of water. A word for what occurs is flaccid. When solution is isotonic the vacuole is not full and that is really bad because a plant needs its nutrients and a full vacuole makes it stand tall (turgar pressure). In a hypertonic solution, the vacuoles lose water; the cytoplasm shrinks and chloroplast are seen in the center of the cell. A word that describes this is plasmolysis. This is bad for a plant cell because the retraction of the cell membrane causes it to rupture/tear.In this experiment we tested potatoes and put them through some solutions that have different concentrations to see what would happen. Would it shrink or would it swell? Those were the two main questions that were asked in this lab.Hypothesis:Based on prior knowledge I made an educated guess on the outcome of the results. For my hypothesis I said that for the molarity level of 0 and .2 the potato core was going to swell, making the condition the cores were in hypotonic. When the molarity turned into .4 I said that the core would stay the same and therefore be isotonic. When the core was placed in the .6, .8, and 1 molarity solutions I thought that the cores were going to shrivel making the conditions hypertonic. The reasoning behind these assumptions is based on the definition of molarity. Molarity is the measure how concentrated something is. The reasoning why I think its starts to swell at first but then shrink is because the less concentrated a solution is causes it to have more water to be available in its surroundings. So the more concentrated the solution is will...

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