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Investigating Osmosis Using Potato Cylinders

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Introduction

Investigating Osmosis Using Potato Cylinders Aim:- The aim of this investigation is to see how the sugar concentration of a solution eventually affects the size of a submerged potato cylinder. I am conducting this experiment to further my understanding of osmosis. The increase or decrease of the size of the potato cylinder can be explained by osmosis. ________________________________________________________________________ Introduction:- The core scientific principle, related to my investigation is that of Osmosis, below I intend to relay information thus. Osmosis:- Osmosis is basically a form of diffusion, but more specifically: it is the movement of water molecules from an area of high water concentration, through a partially permeable membrane to an area of lower water concentration. Partially permeable membrane:- A partially permeable membrane is a membrane, with holes so small that only water molecules are small enough to fit through, bigger molecule, for instance, sugar and salt are not small enough to fit through. ...read more.

Middle

Isotonic Solutions: In a Isotonic Solution, water concentration, and solute concentration are equal in the solution and in the plant/ potato. A dynamic equilibrium will exist between the number of water molecules entering and leaving the cell. The plant in this case will retain its size. Hypotheses: I hypothesis that when the potato cylinder is in the solution of distilled water it will not change size as the distilled water solution is a Isotonic solution, and as outlined in my introduction the net movement from the solution to the potato will be the same. In the solution of 5 and 15 I hypothesise that the size of the potato cylinder will decrease as these solutions are hypertonic and thus, the sugar content in the solution is greater than that of the sugar content inside the potato, causing water to flow out of the potato and into the solution Apparatus: 1. ...read more.

Conclusion

The size, mass and weight of the potato cylinders. Fair Test: I am going to make my test fair by- leaving the potato cylinders in the solution for the same amount of time by doing this I will make sure that the results are relative and that all cylinders have the same amount of time to OSMOSE, I will also try and make my potato cylinders as close in size as possible, this will further the relativity and congruence that I hope to achieve in my results. Because I am checking the affect of osmosis on the weight and size of potato cylinders I will keep the potato cylinder size the same but change the concentration of sugar in different solutions to see how it affects the cylinders. Results:- Initial potato weight(g) Average Potato Weight(g) Concentration of Solution Weight after osmosis(g) Average Weight after Osmosis(g) 1 2.009 1.9825 0% 2.108 2.1165 1.956 2.125 2 1.970 1.9605 5% 1.974 1.9625 1.951 1.951 3 1.490 1.7800 10% 1.983 1.6875 2.070 1.392 4 1.890 1.9400 15% 1.690 1.745 1.990 1.800 ?? ?? ?? ?? ...read more.

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