Tuesday, March 19, 2019

Find the concentration of sucrose in a potato cell - Plan :: GCSE Biology A2 A-Level Coursework

Find the concentration of sucrose in a potato cell - PlanPlan For Osmosis/Plasmolysis ExperimentAIMIn this taste, I am trying to find the concentration of sucrosein a potato cell. Also I can observe when a cell is totallyplasmolyised.PLANI plan to complete this experiment within an hour. Firstly, I go push through cut 15 potato turns, 3 each for 5 different solutions, each slowness 1.2grams, cut with a 4mm corer to approx (full word) 4cm. I exit measure encumbrance, as length is less accurate. The weight of the chip may vary as much as 0.02 g each way, which go forth make it a lot easier to do, scarce may provide me with less accurate results. I result spend 5 different hoagy solutions of 20 cm3 each, shown to the right. 0M (water), 0.5M, 1M, 1.5M and 2M. I will create 0.5 molar solutions by mixing 10cm3 of water and 10cm3 of 1 molar solution. I will use 3 of each solution to ensure that my results ar correct, and to prevent any anomalies disturbing my result graphs. One of each solution will be dropped into the solution at 10-secondintervals. They will be taken out 30 minutes after precisely, toensure a reliable result. They will then be dried on a paper towel,and right away weighed, and recorded in a pre-written table.RELIABILITY/ FAIR TESTI must overcome many variables in this test. I will control the timethat they are left in the solution, as this will greatly affectresults if they are left in for different amounts of time. Also I mustcontrol how much I dry the chips before measure them, because if Ileave some excess water on cardinal of them, it will be an unfair test, asill be weighing the water as well as the chip. Another point issimple, but just to make sure that the scales I am weighing the chipon are at 0 before weighing the chip, as it may add some mass to thechip. I will use 5 different solutions, starting at 0 molar and overtakingup in 0.5 molar concentrations. I have chosen this because they areequidistant, allowing for easy graph drawing, and in addition because fromthe preliminary experiment, I know that this will give me results thatcan show me the concentration of sucrose in the cells sap, and also goon to show me the concentration that the cell will plasmolyise at. Iwill also control the variety of potato- I will just now use 1 brand, as

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