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Osmosis Coursework Essay Sample

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Osmosis Coursework for Science Class
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The potato cell which has been in lower concentration of water will make the potato chops longer and more turgid. When potato chips is put in higher concentrations of salt solution, osmosis will take place and the potato chips will generally become more flabby, soft and flaccid. Since the vacuole in the potato cell contain much more water the potato chip in general will be heavy if the sugar solution has lower concentration. However if the salt solution is higher that the potato chip then the potato chip will be lighter, as the potato cell will have loss mass trough losing water though osmosis.

Also my preliminary results may have been more inaccurate as only carried out the experiment once and in the final experiment I repeated it 3 times to improve its accuracy. Full Risk assessment and fair test: I am going to try to make my experiment fair as possible through many measures. To make my experiment fairer I will make sure, When I put the potato pieces inside the test tubes that they are all 4cm long. In addition, they are taken out of the test tube in the same order they went in.

Also, the same volume of 4cm of salt solution will go in each test tube regardless of salt concentration. I will wear goggles during the activity part of the experiment to protect my eyes.

I will cut and core the potato on a board. I will be more careful not to cut anything or myself. I will put different test tubes containing the salt solution and the potato chip into beaker with water.

This will help keep steady temperature through the experiment as water influenced environment will be less affected by sudden temperature changes. I will use the same size borer and pencil.

When the experiment are done, I will place the potato chips on paper towel to absorb excess salt solution and then weight it. The experiment will last then 24 hours, as I do not want any bacteria to spread or damage the semi-permeable membrane. I am taking these precautions to make my results more accurate as well.

The potato chips always be 4 cm long before they go in and the same volume of salt solution will be used the concentration will vary.

The experiment itself will be conducted on a normal mild day. I will also wear clear goggles to avoid the salt solution or any other utensils being exposed to our eyes.

Safety was necessary in the experiment and I had to take a great deal of care. To ensure this, I did the experiment while standing in-case of any spillages that would occur. Using a cork borer and scalpel I had to take a great deal of care, as they both are very sharp items and could be harmful to those around me especially if I used them incorrectly. When using these two pieces of equipment I was very careful to make sure I did not cut any fellow pupils or myself. I was also aware when handling the glass test tubes, in case any spillages.

The preliminary graph showed as the concentration increases the volume of the potato cylinders decreases, which clearly supports my prediction. The line is of best fit and is non — linear steady curve, the line slowly decreases and goes down and slowly rounds of. The graph shows there were no anomalous results. The first graph showed as the concentration increases the volume of the potato cylinders decreases, which clearly supports my prediction.

The second graph showed as the concentration increases the volume of the potato cylinders decreases, which clearly supports my prediction.

Here are the possible variables that could have been investigated in this experiment. Concentrations Surface area Temperature The chosen variable is concentration, because this is easy, efficient and can produce good results. The other two would be very hard to investigate and measure, so concentration will be investigated.

The test will be a fair test because most of the factors that will be kept constant in the experiment. The following factors will be kept constant: Length of Potato cylinders. Temperature- which is room temperature. Apparatus s used for each experiment. Total volume of solution. Source of salt solution. Scale used to weigh the potato chips. Potato Light intensity By keeping these things constant the experiment will be fair test, and will be able to give accurate answers.

The experiment variables Concentration of salt solution. Mass of potato- only change in mass is needed so this does not matter. The concentration varies, as this is what we are testing. The mass varies as the mass cannot be kept constant, but this does not matter because only the change in the mass is needed. The results I received were satisfactory and all supported my prediction that as concentration of salt solution increases, the volume of potato decreases — this is osmosis and when the potato cylinders are placed in water they increase in size -to form a turgid state.

In an isotonic solution, there is little change. I feel I obtained satisfactory results I think if there was more time I could have investigated additional factors to broaden my investigation and perhaps even have more accurate results. As could be seen the results I found were not entirely correct.

Ideally I would like to repeat the experiment once more to ensure the results and conclusions I have made are correct. Another reason for the inaccuracy of results could be the fact that the apparatus used for both experiments were not the same. This was due to the fact that the second experiment was carried out after a few days, so the same experiment could not be used.

This may be another possible reason why the results were not accurate the second time round. Different potato batches, and different salt solutions were used which may have caused some hindrance to the results. If these were kept the same for both experiments then the results would be better. The room temperature is similar. As temperature is a possible experiment variable that could have been done instead of concentration, it had to be kept constant.

This is very hard to do, so the experiment was carried out at room temperature, but this could have changed between experiments or during experiments. If the temperature were kept constant then the experiment would be fairer and give better results. This could have been done by doing the experiment in a temperature-controlled room, to ensure that the temperature remains constant.

The experiment could also have given better results if I had used more accurate weighing scales, to give better weight readings. If I were to repeat the experiment I could have possibly found a machine to cut the potatoes. This would ensure that all potatoes would be the same weight and dimensions and make the experiment fairer and give better results.

To find better results, I could also have measured the volume of the solution left when re weighing the potatoes. If this was done, then I could have seen if the volume changes match the mass changes. It would also have provided extra evidence for the accuracy of the results.

In these ways I could have improved my current experiment I carried out. To extend my experiment I could test how concentration affects the rate of osmosis on different vegetables. I could have used different vegetables, like a cucumber.

Then I could find out whether osmosis occurs with the same trends with any vegetable. I could also have done the experiment with another solution instead of salt solution. I could have used sugar solution, and then compared the two sets of results to see if it makes a difference and why it makes a difference. I could also have extended this experiment by testing more solutions with the potato cylinders. I could have used more different concentrations of salt solution to give better results in this experiment.

By doing this I could have found the isotonic point, which is where osmosis is balanced so there is water movement, as the water concentration is the same on both sides of the semi permeable membrane. I cold also have tested how the osmosis rate changes with different potato cylinder sizes.

From this I would be able to see if the size of the potato affects the rate of osmosis. Stem cells are originally defined in the haematological system, but recently have been found in a multitude of other sites. These cells all share the same features of self-renewal and multipotentiality and different types and therapeutic strategies have been defined with respect to the nervous system. Bone marrow, Adipose tissue fat cells and Blood Beetroots contain betalains which are the red pigments present in the cell vacuole.

Betalains are soluble in water and they contain nitrogen. Betalains extracted from beetroot is commonly used as food dye because it is not known to cause any Introduction The cell membrane is the boundary that separates the internal parts of the cell from surroundings. Substances that move in or out of the cells must pass across the cell membrane. Beetroot Beta vulgaris cells contain red pigment called betacyanin. The red pigment is contained in a large vacuole inside the cells.

The vacuole is separated from the cytoplasm of the cell by its Therefore it can be deducted that temperature is one of the factors that affect the diffusion of anthocyanin because the amount of anthocyanin diffused in the distilled water was dependent on the temperature level the sample was To confirm the relationship that diffusion of chemicals depends on the ratio of surface area: I believe that the rate of diffusion will decrease with the increase in the volume of the cell.

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Choose an optimal rate and be sure to get the unlimited number of samples immediately without having to wait in the waiting list. Get Full Essay Get access to this section to get all help you need with your essay and educational issues. Osmosis Coursework Essay Sample Osmosis is defined as the net movement of water or any other solutions molecules from a region in which they are highly concentrated to a region in which they are less concentrated.

As shown bellow osmosis Osmosis in PlantsPlants depend on osmosis to move water from their roots to their leaves. As shown bellow the effect of Osmosis in plant cell. You May Also Find These Documents Helpful The biology of neural stem cells Stem cells are originally defined in the haematological system, but recently have been found in a multitude of other sites.

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- Investigate the Rate of Osmosis in Different Vegetables (Carrot, Potato, Swede, Parsnip and Sweet Potato) In this coursework experiment I plan to find the rate of osmosis in different vegetables (Carrot, Potato, Swede, Parsnip and Sweet Potato). Osmosis Coursework Essay Sample Osmosis is defined as the net movement of water or any other solutions molecules from a region in which they are highly .

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Mar 24,  · Osmosis coursework help? Im writing about the variables that could affect my experiment (leaving potatoes in different sucrose concentrations and measuring mass lost) I dont know how the duration of my experiment could affect the rate of osmosis, because once Status: Resolved. Sep 04,  · Through osmosis, water molecules move in order to make the water potential and concentration of the surrounding solution and the vegetable equal. The reverse occurs when the concentration of the surrounding solution is very low (lower than the vegetable).