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The effects of different concentrations of sucrose on potatoes

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GCSE Biology Coursework: The effects of different concentrations of sucrose on potatoes Planning Aim: The aim of this experiment is to investigate if different concentrations of sucrose affect the rate of osmosis in a potato. Apparatus: I am going to use ( 18 test tubes ( 3 test tube racks ( 1 potato (large) ( Cylinder cutters ( Weighing scales ( Paper towels ( Stopwatch ( Knife ( Measuring cylinder ( Tweezers ( Cutting tile Safety There are a number of safety hazards that can take place during this investigation so these must be addressed. If not, they may cause serious harm. ( Glass breakage, as we are dealing with glass, there is always the danger of dropping a test tube and the glass shattering everywhere. This is why goggles must be worn for one reason to protect the eye from any glass. There is a very high chance of glass slipping out your hand and breaking so goggles are advised. ( Electrical hazards, again as we are working with liquids we must be cautious of any power outlets that may be very near to our workspace. Your chosen workspace must be assessed before any equipment is set up to determine whether there is any danger posed to you in the event of a spillage of liquid. ( Spillages of liquids, spillages of liquids not only present potential electrical hazards they also pose as hazards in themselves. On a slippery surface liquid can cause one to fall and injure themselves severely. In the event of a liquid spillage - all those in close proximity should be warned of the hazard - and the liquid mopped up carefully by you. ...read more.


Firstly, in the preparation of the solutions process, I will pour 40ml of sugar solution into a measuring cylinder. Then, after getting an accurate measure of the sugar solution, I will pour the solution into a test tube and label it 1. Then, after washing out the measuring cylinder, I will repeat the process. However this time I will pour 32ml of sugar solution and 8ml of water into the measuring cylinder. Next I will pour the mixture into a test tube and label it 2. I will repeat the process making sure that each time the measuring cylinder is cleansed, 8ml less of sugar solution is used and the rest of the mixture will be water, making a total of 40ml�. Every time each test tube contains 40ml�, it will be labelled with a number from 1 to 6. The last tube (tube 6) will contain 40 ml of tap water. Concentration (Molar) Amount of water (ml) Amount of sugar solution (ml) Total amount of solution (ml) 0 40 0 40 0.2 32 8 40 0.4 24 16 40 0.6 16 24 40 0.8 8 32 40 1 0 40 40 After preparing all the solutions, I will place each potato chip in each test tube. Hence each test tube will contain 40ml of solution and a potato chip. I will leave each test tube for 25 minutes, according to my stopwatch. After this time I will put each potato on the paper towels using tweezers. The potato chips extracted from the sucrose solutions will be dried in practically the same way. ...read more.


Also we can see that in the future a greater range of concentrations should be examined to allow for a suitable graph to be plotted and any trends in result to be examined. Altogether the experiment has been a valuable one, as it has identified the general pattern of results, which we should be looking out for in any future results as well as the improvements that can be made to this experiment. The method utilised was a good one. It was accurate to a certain extent, depending on the variables and the number of repeated results. From the method I used I could gather a conclusion which would concur with my hypothesis. The results were reliable as I followed my plan and the tried to abide by the fair test factors. The evidence can support a conclusion but not a firm one as further work still needs to be undertaken. On the other hand the results followed my sensible hypothesis in which I supported with my scientific knowledge. I repeated the experiment to produce an average, preventing the attainment of anomalous results. Because of this valid reason I have decide to produce a conclusion based on the evidence I have presently. The improvements that I propose are: ( A greater range of concentrations should be examined ( A greater number of repeats should be taken for each sucrose concentration I can also propose further work. After undertaking my improvements I would use a variety of concentrations and observe how each concentration would affect the potato. Osmosis Coursework Navninder Singh Sandhu Page 1 of 14 ...read more.

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