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Osmosis is the movement of water through a semi-permeable membrane from a dilute solution to a concentrated solution.

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Introduction

Science Investigation Potato Osmosis Planning Osmosis is the movement of water through a semi-permeable membrane from a dilute solution to a concentrated solution. [image002.jpg] Prediction In a potato the cells of the potato will have a certain amount of sugar in them, so with the lower concentrations of sugar, water 0.0-0.5 M Water should move into the potato because there will be a high concentration of water outside the cell than in water will diffuse into the potato, with the higher concentrations of sugar 1.0-2.0 M water should move out of the potato because there will be a higher concentration of water inside the potato than outside. Eventually either the cells of the potato will become quite hard because of the amount of water inside the potato's cytoplasm putting it under pressure (osmotic pressure) pressing the sides of the cytoplasm into the cell membrane this will happen with the lower concentrations of sugar. ...read more.

Middle

Method To measure how osmosis affects a potato I will need to accurately measure the weights of each potato measure the mass of the potato is an accurate way of measuring the rate of osmosis because as water moves in and out of the potato and water has mass the mass of each potato will therefore increase or decrease. We will be observing the effects of five different solutions on the potato chips these will be. 1. 0.0M 2. 0.5M 3. 1.0M 4. 1.5M 5. 2.0M We will take potato chips each measuring 2.7cm in length pre-determined from our preliminary results 1cm in depth and 1cm in width, we will place the chips into 5 separate 500ml beakers (also pre-determined by our preliminary work) each containing three chips we will take the percentage of weight lost from each of the three potatoes and then take a mean average of from those three values. ...read more.

Conclusion

Mass of potato (g) Mass of potato (g) Mass of potato (g) 1 2 3 Gained 0.0 8.4% 6.5% 8% Lost 0.5 10.6% 11.3% 10.3% Lost 1.0 19.3% 20% 19.6% Lost 1.5 25.6% 33% 10.6% Lost 2.0 28% 31% 29% I then took a mean of each potatoes percentage. Weight lost or gained Solution strength Mean Percentage of Mass. Gained 0.0 7.6% Lost 0.5 10.7% Lost 1.0 19.6% Lost 1.5 25% Lost 2.0 29.6% Analysis From my results I can conclude that as the concentration of the solution increases so the mass of a potato placed into that solution decreases. However when a potato is placed into a solution of 0.0M (Water) the mass of the potato increases this is due to Osmosis. Osmosis is the movement of water through a semi-permeable membrane, water moves from a high concentration of water and therefore a low concentration of the solute to a low concentration of water and therefore a high concentration of the solute. ...read more.

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