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Osmosis in Potatoes

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Osmosis in Potato's GCSE Science Coursework Jenna Dawson Aim: To investigate the effect of varying concentration of a certain sugar solution on the amount of osmotic activity between the solution and a potato chip of a given size. Research: Osmosis is when the molecules move about a solvent, through a semi-permeable membrane, decreasing the concentration of a solute on the other side of the membrane. The principle of this is to match the two sides of the membrane, so they are balanced. This is caused by osmotic pressure, an irreversible type of diffusion. This is when molecules jump from one place with a high concentration to another with a low concentration. Plan: To find out the rate of osmosis in a potato chip, we can place the chips in five different solutions: i. Distilled water ii. 5% of sucrose solution iii. 10% of sucrose solution iv. 15% of sucrose solution v. ...read more.


I have chosen to vary the concentration of the sugar solution. This will give me a varied set of results If any of the non-variables below are not kept constant it would mean it would not be a fair test. For instance if one of the potato chips was 1cm longer the surface area of the chip would be larger and there would therefore be more space for osmosis to occur Non - variables * Keeping the temperature the same. * Use same potato and treat each chip the same e.g. have all been cut without being washed. * The mass of the potato is a dependent variable, and this means that it will be measured all the way through the experiment. I will measure the mass in grams. The potato chip will be measured before it is put in the solution, and after. This will allow us to see whether osmosis has taken place, and to what degree. ...read more.


Evaluation: the experiment was very successful in my opinion. I obtained accurate results from which I was able to create informative graphs. The time that I used for the experiment to last was enough to allow sufficient osmosis to occur. However if I was to repeat the experiment I might well increase the time of the result to allow more osmosis to happen and possibly find out the saturation point of the chips. The range of concentrations was sufficient but I would possibly create more concentrations if I repeated the experiment so that I would have more varied results, i.e. 0.10m, 1.15m, 1.20m, and so on. The cutting of the potatoes was the most difficult part of the experiment as although I was recording my results by mass, it could well have affected the surface area and so the overall rate of osmosis. As well as the potato I could have found a more accurate way to measure out the solutions and to determine the molar concentrations. ...read more.

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