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Find out if osmosis occurs in a potato, and how it affects the potato in different molar solutions of sugar and water.

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Introduction

Aim: My main aim in this experiment is to find out if osmosis occurs in a potato, and how it affects the potato in different molar solutions of sugar and water. Factors * Type of cell * Different solutions * Concentration of solution * Time cells are in solution * Mass of cells * Surface area of cells * Temperature of solution Prediction Osmosis is the passage of water molecules from a weaker solution into a stronger solution, through a partially permeable membrane. In the distilled water, I believe that the water is more concentrated in the potato, and therefore the water should transfer from the water to the potato, making the potato bigger in size, and heavier in mass. The potato tissues, being surrounded by a weak solution, will be most likely to swell up and become turgid, taking in all the water it can possibly take in. With the potato in 5% solution of sugar, I don't think there will be much change in the mass of the potato. This is because there isn't much difference between the two substances. I believe that the mass and the size of the potato won't be altered much. ...read more.

Middle

Fair Test If I am going to make this a fair test, then I will have to control these factors. Doing the tests at one fixed temperature will control the temperature of the water. For the purpose of my experiment I am going to do all the experiments at room temperature. The size of the potato is very important. This is because if the size of the potato varies, so will the amount of mass it can loose or gain. I am going to try to cut all the pieces of potatoes, to the same size. Because of the 'chipper� I will have chips with the same width but the length of the chips will differ. I am going to cut the chips to 3cm in length. The mass of the potato is a variable, and this means that it will be measured throughout 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 how much osmosis has occurred. The volume of the solution that the potato chips are kept in must be the same. ...read more.

Conclusion

It is a strong negative correlation. As the concentration increase the mass decreases. For the concentrations' 10%, 5% and 0 %( distilled water) the mass of the potato increased. For 15% the mass stays almost the same with just a tiny increase. For concentrations' of 20% and 30% the mass decreases. 15% is the equilibrium Evaluation We followed the plan correctly; I believe we gained accurate and sufficient enough results to conclude the experiment, and to prove our hypothesis. My final results were very reliable, due to the precautions I took to make this a fair test. I think I took enough results for the coursework. The range of results was big enough. Also to make my experiment more accurate I could have repeated it more. I could have also cut the potatoes into slices, to give a larger surface area for osmosis to occur on. I could extend my coursework by testing the chips using a different substance. By this I mean using a different thing instead of sugar, i.e. salt or coffee. Then I could find out whether osmosis occurs differently with different things diluted in the water. I could even use different vegetables. . . . Biology Coursework Investigate the effects of placing cells in different solutions Ben Hall ...read more.

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