Tuesday, May 28, 2019

Find out the concentration of the cell contents of a potato :: GCSE Biology A2 A-Level Coursework

Find come on the concentration of the cell contents of a taterIntroductionOsmosis is the diffusion of water from a lower concentration of soluteto a higher concentration of solute through a partially permeablemembrane. This lets smaller molecules much(prenominal) as water, pass through butdoes not allow bigger molecules through. The molecules continue todiffuse until they reach a balanced state, where no area has a higheror lower concentration than any other.In a high concentration of water the amount of kale solution is low.This is called a fainthearted/dilute solution. In a weak concentration ofwater the amount of sugar solution is high. This is called astrong/concentrated solution.When a semi-permeable membrane divides deuce solutions, the water willmove from the area of high concentration to the area of lowconcentration, until both sides are equal.AimTo find out how much sugar concentration there is in a cell of apotato. This means I will put the potato cylinders in antith eticsolutions of different concentrations. in that respect are also other factors involved, these are Temperature of water Size of potato cylinder Mass of potato cylinder Volume of solution potato cylinder is in Type of potato Time left in solutionFair TestingIf this experiment isnt a fair test, we will be collecting the wrongresults, which can lead us to the wrong conclusions. To conduct a fairtest I will ensure that the experiment is carried out at roomtemperature. The size of the potato is an important factor, as theamount of weight lost or gained will alter. Also the potato cylinderswill be weighed before and after the experiment to see if osmosis hastaken place. The type of potato I will use will stay the same asdifferent potatoes may absorb at different rates.Planned MethodA range of sugar solutions will be arranged with concentrations..Sections of potato will be cut with a scalpel and measured with aruler. This has to be done carefully as the difference of surface areamay all ow more or less osmosis to occur. The mass of each cylinderwill be weighed to ensure consistency. I will do each experiment threetimes so that I can take an average for each sugar solution. By doingthis I will receive more accurate results and therefore draw up a moreaccurate conclusion. I will also use 20 ml of each solution and oftap water. The potato cylinders will accordingly be left for 15 minutes. Whenthe cylinders are removed I will clean them with a paper towel, toremove excess moisture, and then re-weigh them.PredictionFor this investigation, I think the lower the concentration of the

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