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In my experiment, my aim will be to find out if osmosis occurs in a potato, and how the potato will be affected in different molar solutions of sucrose and water.

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Introduction

The Study Of Osmosis in a Potato Aim: In my experiment, my aim will be to find out if osmosis occurs in a potato, and how the potato will be affected in different molar solutions of sucrose and water. Apparatus: > Stop watch - To time my experiment > Cutting tile - To cut the potato on it > Knife - To cut the Potato > Measuring cylinder - To measure the solutions > Distilled water - which is part of the experiment > Sucrose - Which is part of the experiment > Potatoes - Which is part of the experiment > Tissue paper - To dry the potato after the osmosis has taken place > Balance - to weigh the potatoes > Borer - to cut up accurate measurements of the potato Planning: Before I plan out my experiment, I am going to do some background information on osmosis; this will help me to make my prediction, Background information: Osmosis is the movement of water molecules from a dilute solution to a concentrated solution, through a semi-permeable membrane. The concentrated solution has molecules in it that are too large to be able to pass through the semi permeable membrane, but the water molecules are small enough to be able to diffuse through it. Therefore Osmosis is the diffusion of water molecules from a high water concentration to a lower water concentration throught a semi permeable membrane. ...read more.

Middle

Other than that there are not really any other safety issues in this experiment. Method: Firstly I will get the pieces of potatoes ready, I will push the borer through the potato, cutting it into long cylinders. And I will cut out 5 of these because I am going to be testing these in five different solutions of sucrose solution, 0.1, 0.2, 0.4, 0.6, and 0.8. I will weigh each set and have them ready to be put into the test tube of the different solutions. Once I have put them in I will start the stopwatch and will leave the potato cylinders in there for five minutes. Then once the five minutes are up, I will remove the potatoes, and blot dry tem with the tissue paper. This will ensure that I weigh only what is in the potato and not any liquid which may have been left on the surface. Then I will weigh them. Then I will record my results down onto a table. And I will repeat this three times to ensure the fair testing, and to make sure that there are no anomalous results which would have corrupted my conclusion. Obtaining evidence: Below are my results that I collected from my experiment. 1. Sucrose Solution Height Weight New Weight % Change 0.1 Molar 5cm 2.47 grams 2.59 grams 4.9 0.2 Molar 5cm 2.44 grams 2.50 grams 2.5 0.4 Molar 5cm 2.43 ...read more.

Conclusion

of where the graph line crosses over, we can see that a sucrose solution of roughly 0.3 molar will be the solution of where mass is neither gained or lost. Also this would be the concentration of the solution inside the potato. Evaluation: The experimental set-up was fine in showing the effects of osmosis in a potato. I am very pleased with my experiment and I believe it went very well, I came across no difficulties and there wasn't any anomalous results. I am certain that my results that I obtained were accurate when I carried out the experiment. I believe this because out of the three times that I carried out this experiment, they all showed virtually the same results. My results all agree with my prediction that the higher the concentration of sucrose solution the more mass the potato will lose and vice versa. My results also concur with the osmosis theorem. Osmosis is a special case of diffusion, where water molecules move from a high concentration to a low concentration, through a semi permeable membrane. If I were to do this experiment again, in order to improve it, I would do it using a greater range of concentrations to obtain more accurate results so that I am able to produce more accurate graphs. I would also measure the change in size of the potato pieces. Jonathan Suleyman - 1 - 01/05/2007 Biology Coursework ...read more.

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