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Osmosis Coursework

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Osmosis Coursework Planning Our aim is to understand the process of osmosis and how it works in the cells of living organisms and why it is important to animals and plants. The experiment will be evidence to prove that osmosis is the process of particles from a high concentrated solution to a low concentrated solution by a permeable membrane. While this experiment is taking place, we need to ensure that a fair test is carried out in the safest possible way. The independent variable, which is the variable we will be changing, is the concentration of solution in which the potato will be contained. But I will change it in a controlled and steady pace, for example, increasing the concentration by 0.1 molar. The dependent variable, which is the variable we will be measuring, is the mass of the potato (before and after its placed in the solution). However, in the experiment I will make sure I will change only one variable, so it is kept as fair as possible. The equipment required to do this experiment are: * 5 petri dishes to carry out the different concentrations of solution. * 10 small cylinders of potato 2.5cm in length and approximately weighing the same. ...read more.


Therefore, we decided to spread the time over thirty minutes. The longer the time, the more of a difference we will see in the potatoes and the more osmosis will have taken. The minimum of reading was 5 so we did five reading just to be the change gradually taking place. Our method was to place a potato cylinder marked "A" and one marked "B" in each petri dish until the five were taken up. So altogether, it added up to ten slices. We put them in at the same time and waited for thirty minutes and took them out at the same time too. To make sure the results are more reliable and precise, it is advisable to do the experiment twice or three times just to see if the results were going in the same pattern. The more trials that are being done, the more accurate the results will be. My prediction is, in the less concentrated solution, the potato will increase in mass because the potatoes will be highly concentrated and it needs the distilled water to balance the concentration out. As the concentration gets higher, the potatoes will begin to lose mass because the potatoes will be lower in concentration compared with the 1.0 molar and it will lose mass in order to be level. ...read more.


So we weren't sure whether our results were accurate enough or not. No body else was able to do a second trial so in the end, we decided to compare our results. Everyone's results were different mass wise but the patterns were very similar to our experiment and my prediction. Table showing the mass of the potatoes before it was placed in the concentrations of solution INDEPENDENT VARIABLE DEPENDENT VARIABLES CONCENTRATION OF SOLUTION (MOLAR) POTATO A (GRAMS) POTATO B (GRAMS) Distilled water 2.07 2.1 0.1 1.91 2.09 0.2 1.87 2.09 0.5 1.92 1.99 1 1.94 1.96 Table showing the results of the experiment after the potatoes were taken out of the concentrations of solution after 30 minutes INDEPENDENT VARIABLE DEPENDENT VARIABLE CONCENTRATION OF SOLUTION (MOLAR) POTATO A (GRAMS) POTATO B (GRAMS) Distilled water 2.12 2.17 0.1 1.95 2.12 0.2 1.89 2.1 0.5 1.76 1.83 1 1.64 1.67 Table showing the percentage change in mass between Potato A before and after POTATO A (GRAMS) BEFORE POTATO A (GRAMS) AFTER 30 MINS PERCENTAGE CHANGE (%) 2.07 2.12 102 1.91 1.95 102 1.87 1.89 101 1.92 1.76 92 1.94 1.64 84 Table showing the percentage change in mass between Potato B before and after POTATO B (GRAMS) BEFORE POTATO B (GRAMS) AFTER 30 MINS PERCENTAGE CHANGE (%) 2.1 2.17 103 2.09 2.12 101 2.09 2.1 101 1.99 1.83 92 1.96 1.67 85 1 1 ...read more.

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