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Scientific Investigation about Osmosis

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Introduction

Scientific Investigation about Osmosis Planning As we know that plants take water from the soil to make food during photosynthesis. Photosynthesis occurs mostly in leaves. All plants have cells and all cells contain water and have a shape. I am going to investigate, whether different concentrations of sugar solution effect the size and mass of the potato chips. In this investigation, I am using sugar solution and potato chips. When sugar is dissolved in water, it is known as sugar solution. This sugar solution has molarity, which is a measure of concentration. I am using different molarities of sugar solution to find the effect of concentration of sugar solution on size and mass of potato chips. Potatoes are made of plant's cells, because it is obtained from plants. By using potato chips, I will find the results about transfer of water in and out of plant cells. This in and out movement of water in the cells effects the size and mass of the cells in a plant. In this experiment the variables are 'Different concentrations of sugar solution'. Other factors that also effect the potato size and mass will remain the same. I will use same size and mass of potato chips and same volume of sugar solution in specific amount of time, but the concentrations of sugar solution will be different. As we know that all plants contain a large vacuole. A vacuole is a fluid-filled space in the cytoplasm surrounded by a membrane. It is a permanent feature of the structure of the cell, with an important role to play. The vacuole of a plant cell is surrounded by a membrane called tonoplast. Vacuole is filled with cell sap, a solution of various substances in water. The water moves in and out, in the cells. This is due to Osmosis. Osmosis is the net movement of water molecules from a high concentration of water (dilute) ...read more.

Middle

I got the result that, when the molarity of sugar solution decreased to 0.6, the average final mass of the potato chips decreased to 99.17% from its original mass of 100%. There was very little difference in the mass of the potato chips at molarity of 0.6 from its original mass. As the molarity of sugar solution decreased to 0.5, the average final mass of the potato chips increased to 110.69% from its original mass of 100%. Therefore, when the molarity of the sugar solution decreased to 0.25, the average final mass of the potato chips increased to 122.47% from 100% of its original mass. My results showed that the length or size and mass of the potato chips increase, if the molarity or concentration of the sugar solution decreases. This increase in size or length and mass is due to Osmosis. Osmosis is when a hypertonic solution is separated from a hypotonic solution by a differentially permeable membrane, a net of flow of water molecules occurs through the membrane from the hypotonic to the hypertonic solution. When there is no longer a net flow of water both solutions are isotonic with each other. This increase and decrease of size and mass of potato chips are due to hypotonic, hypertonic and isotonic. The presence of the cellulose cell wall makes a lot of difference too. Although it is freely permeable, it exerts an inward pressure on the cell and so has an effect on osmosis. If the cytoplasm of a plant cell contains more solutes than the surrounding fluids, water will enter the cell by osmosis. Similarly, if the vacuole contains less water molecules and more solute molecules than the surroundings, then the water will enter the vacuole by osmosis. The inward pressure of the cell wall builds up as vacuole swells and at this point cells are rigid, in a state known as turgor. ...read more.

Conclusion

I should dip them all in different concentrations but same volume and in same equipment so that these all are dipped properly. I should use greater difference of concentrations of sugar solution, because it gives more different results. When the potato chips are dipped properly, I should start the time for each one. After specific time about one hour, I should weigh them directly. I should not use the filter paper. It absorbs the solution in different quantity. I should record the results of the masses. I should use the scale to three decimal places. Then I should use Varnier Calliper to take the length, because it is more accurate. To further my investigation, I should try to find the effect of light and temperature on size and mass of the potato chips. I should use different temperature of sugar solution and put then under different light intensities. For fair test and to further my investigation, I should ignore the anomalous results. In this investigation, I got an odd result, which effected my results, but not much. I should ignore such results and repeat my experiment. I should not only reject these results, but to find out what was the reason behind it, so that I do not repeat the same mistakes. My results are reliable, because they are the same as the scientific theory. They were same as my prediction. I repeated the experiment three times and I use five different concentrations of sugar solution, therefore they are more reliable. They give me a range of idea, which is reliable to the scientific theory. To make my results more strong, I should have more results, so that I can get less range of different results. As my results are reliable, therefore I can have a firm conclusion, although it was not a fair test completely. In this experiment, I got enough results to approve my predictions. I should take more results, so that I can approve or disapprove my predictions with a firm conclusion. The End ?? ?? ?? ?? Wais Ahmed 10.6 ...read more.

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