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The osmotic potential of a potato

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Introduction

The Osmotic Potential of a Potato Peter Hicks Aim The aim of this experiment is to find the osmotic potential of a potato weighing approximately 1.09 grams. Experiment I place 6 pieces of potato each weighing approximately 1.09 grams in 6 test tubes. I then added different concentrations of sugar sucrose solution to each one which both adds up to 10 mols. For example 4mols. of sucrose concentration and 6mols. of water . I then repeat this procedure to ensure that the results are accurate meaning there will be 2 test tubes each for the same concentration of liquid. I then wait 24 hours approximately, and then weigh the 12 pieces of potato. Once the pieces are weighed I can tell the osmotic potential, I then process the information into a graph and calculate the osmotic potential. Here is a test tube that I used Fair Points -Use the same amount of liquid in each tube to ensure accuracy -Use the same type of test tube to ensure accuracy -Have the same surface area for each potato piece to ensure consistency -Wait for the same amount of time before weighing the piece of potato to ensure accuracy -Repeat to make sure that the results are accurate and reliable -Use the same Potato to ensure that the cells are all similar -Have them in the ...read more.

Middle

weight of the potato piece will be due to the hypertonic solution making the cells of the potato piece flaccid because the water particles will diffuse into the medium concentrated potato cells into the high concentrated sucrose solution meaning there will be less water concentrate in the potato cell making it flaccid. On the other end however the more water there is the more the potato piece will weigh this is due to the hypotonic solution where the cells are made turgid, this is because there is such a high concentration of water that the cell reaches its maximum capacity for water. Where the results are similar for example 4mols. of distilled water and 6mols. of sucrose solution, the cells will be more isotonic due to the slightly more equal amounts of solution of distilled water and sucrose solution, this is where water will go in and out of the cell via osmosis. Results Graph and Table shown separately Results/Summary The following results of the investigation showed that the prediction of the following were within reason supported, that the lower the concentration of sucrose the more the water will move into the potato piece through the process of osmosis and the higher the concentration the more flaccid the potato piece will be due to the water passing out of the potato due to osmosis. ...read more.

Conclusion

However there is a big change when the percent change in mass drops radically, this is when there is a 0.4 concentration of sucrose solution and a 0.6 concentration of water. The mass changes so radically because water diffuses out of the potato cell creating equilibrium because the concentration gradient for the water in the potato cell is equal, but not outside. Meaning the mass of the potato cell will become less. There were no were clear anomalies in my graph however no one else in my class had a graph like mine. My evidence in the graph supports my summary that the lower the concentration of sucrose the more the potato will weigh and the more the sucrose concentration the less the potato will weigh. However the experiment could have been more reliable if I had used more than 5 points (had more potato pieces). To increase my knowledge of the subject I could have used a different aged potatoes or different vegetables. Using the same apparatus I would perform the investigation having the potato pieces and or the vegetables in a slim shape weighing the same. I would do this because the other vegetable might perform osmosis quicker. After the investigation I would perform the results and compare the average percent change, and take away the differences. Then can compare the osmotic potentials of the other vegetable or the older potato with the original potato. ...read more.

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