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To Investigate How Concentration Effects Osmosis On Potato Chips.

6593 words - 26 pages

SCIENCE COURSEWORKAim: To investigate how concentration effects osmosis on potatochips.Introduction:I have been asked to investigate the effect of osmosis on potato chips. Osmosis is the diffusion of water from a lower concentration of solute to a higher concentration of solute, through a membrane.I have chosen to investigate the effect of the water potential/concentration of solution on potato chips. This means that I will put potato chips into sucrose solutions of different concentrations. These concentrations would be ones such as these; 0molar, 0.2m, 0.4m, 0.6m, 0.8m, 1.0 and distilled water.There are other factors involved and these are;1) Temperature2) Water potential of potato initially3) Size of potato4) Light intensity5) Mass of potato dependent variable6) Volume of solution potato chip is in7) Type of potato8) Time left in solution9) Surface area of potato chip10)Use the same balance to measure chipOsmosis is the movement of water down a concentration gradient through a partially permeable membrane.Osmosis through a partially permeable membrane continues until the concentration of water on either side of a membrane is equal.Osmosis is a special kind of diffusion; it happens when a membrane has tiny holes in it, which let water molecules through but stop larger molecules, like sugar. A membrane like this is called semi-permeable.This experiment shows osmosis: -Cell A Cell Bbecause osmosis is the movement of particles from a weakconcentration to a strong concentration through a semi permeable membrane the water will move from the beaker into the visking tubing.PartiallyPermeableMembrane.Before AfterOsmosis OsmosisWater moleculesPartially Weak strongPermeable Solution solutionmembraneWater molecules diffuse from a high water concentration to a lower water concentration.A wilted leaf will be more concentrated because it has lost water and the leaf will dry out.If a red blood cell is put in water, water enters the cell by osmosis. This is called endosmosis. The cell swells up and eventually bursts, just as a balloon would do if you blew too much air into it. However, if you put a red blood cell in a salt solution which is a stronger than that inside the cell, water leaves the cell by osmosis. This is called exmosis. As a result the cell, shrinks and crinkles (figure 5). This is very important in our bodies, it means that the fluid part of the blood (plasma), in which the cells float around, must have just the right, strength to prevent osmosis occurring in either direction.If you put a plant cell in water, water enters by osmosis and the cell swells up. However, it doesn't burst. This is because the cellulose wall is tough, like elastic: it stretches but does not break. Eventually the cellulose cannot stretch any more and so the cell stops swelling. It's like trying to blow up a football into which no more air can be pumped. When this point is reached, we say the cell is turgid. Turgidity is very important in plants because it helps to make...

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