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The Effect of Glucose Concentration on Osmosis through Potato Tissue

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Introduction

The Effect of Glucose Concentration on Osmosis through Potato Tissue Aim: To show how varying the concentration of glucose can affect Osmosis through potato tissues. Background Information: Osmosis can be loosely be defined as 'the movement of water molecules from a region of higher water concentration to a region of lower water concentration through a partially permeable membrane.' Solute molecules make weak chemical bonds with water molecules. Solutions with many solute molecules bind most of the water molecules. Water molecules bound to solute molecules move more slowly than free water molecules. Isotonic solutions have the same concentrations of water molecules, so the rate at which water molecules diffuse into and out of the cell is the same. Hypertonic solutions have a lower concentration of water molecules compared to the inside of a cell and so there is a net movement of water molecules out of the cell. Hypotonic solutions have a higher concentration of water molecules compared to the inside of a cell there is a net movement of water molecules into the cell. This causes the cell to swell; a cell that is full of water but has not burst is said to be turgid. ...read more.

Middle

Analysing and Conclusion: The graph shows 3 different lines showing the changes in weigh in different concentrations of sugar solutions over different periods of time. The lines that represent the changed in weigh after 30 minutes, 60 minutes and 90 minutes all shows the correlation that as the concentration increases, the weigh of the potato cords would decrease. In most of the concentrations of the sugar solution (0.4, 0.5, 0.6, 0.8 and 1.0), the potato cords have significantly decreased in weight. This is because if the solution's concentration had a lower concentration of water molecules compared to the cells in the potato (hypertonic), then the direction of the net movement of water molecules would diffuse out of the potato cells and into the solution. The potato cord would be flaccid and decrease in weight. In the water, the weight of the potato cords increased, this is because the solution's concentration was hypotonic meaning that the solution had a higher concentration of water molecules compared to the cells in the potato, then the direction of the net movement of water molecules would diffuse out of the potato cells and into the solution. ...read more.

Conclusion

This makes the weight of the potato cords to decrease from its actual weight. - There are errors in the accuracy of equipment. - Different parts of the potato were used, organic matter is different, different parts do different things. (Eg in humans, the liver tissue is different to the skin tissues, the same applies to all organic matter). - Pure water was not used, instead tap water was used, this mean there were ions and solutes in the water which affects osmosis. Solute molecules make weak chemical bonds with water molecules, this constrict the movement of water molecules, making them move more slowly then those in pure water. To improve and check the results, I would repeat the experiment several times to ensure consistency and to ensure that my results are similar and valid and that there were no major differences. Other improvements could be: - Using 5 tubes per cup (the more the better) - Use the same potato - Use pure water - Research on different varieties of potatoes and see if osmosis are the same in all. - Repeat the experiment on the same variety of potato - Measure the temperature and keep it at a constant 1 ...read more.

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