Tuesday, May 28, 2019

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

Find out the tightness of the stall contents of a potatoIntroductionOsmosis is the diffusion of wet from a trim down concentration of soluteto a nobleer concentration of solute through a partially permeablemembrane. This lets smaller molecules such as water, pass through butdoes non allow bigger molecules through. The molecules continue todiffuse until they r individually a balanced state, where no area has a higheror lower concentration than all other.In a high concentration of water the amount of sugar solution is low.This is called a weak/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 two solutions, the water testamentmove 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 leave behind put the potato cylinders in differe ntsolutions of different concentrations.There 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 fundamental 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 hasinterpreted place. The type of potato I will use will stay the same asdifferent potatoes may absorb at different rates. aforethought(ip) 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 area may allow 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 then be left for 15 minutes. Whenthe cylinders are remove 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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