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I am conducting this biology investigation to find out whether the weight of the weight of a potatoes changes whilst put into different strengths solutions of water and salt. The weight of the potato will change due to a process called osmosis.

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Introduction

Biology Investigation Introduction I am conducting this biology investigation to find out whether the weight of the weight of a potatoes changes whilst put into different strengths solutions of water and salt. The weight of the potato will change due to a process called osmosis. Osmosis is a special diffusion. Water flows from a weak solution to a strong one. It happens when a membrane with tiny holes in it which let water molecules pass through but stop lager molecules, like salt. A membrane like this is called semi permeable in this experiment the semi permeable membrane is the potato. I have already carried out a similar experiment in year 10 this helped me decide how long to leave the potato in the solution and what strength of the solution I should use. Osmosis Diagram Hypothesis Osmosis is the movement of water molecules from a weaker solution to a stronger one, through a semi permeable membrane. In this experiment the little holes in the potatoes will allow water to pass in and out of the water and salt solutions. Using results from a previous experiment I conducted last year I am able to make a fairly accurate prediction. I predict when the water concentrations lower in the tissue the water particles will diffuse into the potato therefore the potato will gain weight. ...read more.

Middle

Independent Variable; My independent variable is the concentration of the solution. Dependent Variables; My dependent variables are the volume of the potato cylinders and the mass of the potato cylinders. Apparatus Clock Knife Balance Test tubes Test tube rack 5cm3 Syringes Beakers Tissue paper Weighing scales Distilled water Sucrose Fair Test I will make sure this experiment is fair because if the experiment is not carried out fairy the results I am obtaining maybe wrong, and this will lead to a wrong conclusion. I will make sure that the potatoes are weighed correctly before they are placed in the solution. I will also make sure that the potato are fully covered by the solution, this is because the potato should have total contact with the solution. I will also make sure that any skin on the potato is peeled of because the skin may affect the osmosis taking place. I will also make sure I time all the potatoes correctly and make sure they all have an equal amount of time in the solution. After conducting the experiment I should make sure I dry each piece thoroughly this is to prevent any solution not absorbed by the potato being weighed will also use different syringes for the sucrose and water solutions this is to stop the solution the measurement of the solution being inaccurate. ...read more.

Conclusion

Evaluation I followed my plan correctly and managed to gain accurate and sufficient results. I also managed to prove that my hypothesis was correct. However to make my result more accurate I could have carried out one experiment at a time decreasing the time it takes to get the potato chip onto the weighing scales. This would increase the chance of getting an accurate reading. Using more types of molar solution would have also made the results more accurate and better results; doing this I could have made sure all my results were totally correct. Also maybe leaving each set for an hour this would have enabled Osmosis to reaches full capability, therefore telling me how much water could be transferred from each solution. However I did not have enough time to carry out each set for an hour. Also maybe repeating the experiment four times would have given me more accurate results and also showed up any anomalous results. Because I only carried out the experiment twice no anomalous results were clearly visible. Therefore I have no anomalous results. I could have also used more accurate syringes to make sure that the measurements of each solution were accurate, therefore producing more reliable results. Overall I am pleased with my experiment given the time I had to carry out the experiment and also the apparatus available to me, I was able to obtain reliable. 1 ...read more.

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