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Osmosis Investigation

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Introduction

Osmosis Investigation AIM: To investigate the rate of osmosis in potatoes with different concentrations of glucose. HYPOTHESIS: Osmosis is the net movement of water or any other solution's molecules from a place in which is highly concentrated to a place in which is less concentrated. This movement must take place across a particular permeable membrane such as a cell wall, which lets smaller molecules through being the water, but does not allow bigger molecules to pass through. The molecules will continue to diffuse until the area in which the molecules are found reaches a state of equilibrium, meaning that the water molecules are randomly placed throughout the potato, with no area having a higher or lower concentration than any other. PREDICTION: I predict that the pieces of potato with the weaker concentrations of glucose will weigh less at the outcome of this experiment, than the potatoes with the stronger concentrations. This is due to the water molecules exchanging from a higher concentration, which is the glucose solutions, to a lower concentration, which is the potato. I predict this because, the higher the concentration of glucose that transports from a higher concentration to a lower concentration, the stronger the osmosis becomes. ...read more.

Middle

So our results may have some anonymous results due to human error, therefore we wont be doing an average results chart. METHOD: 1. We measured out 6 pieces of potato to a weight of 0.5 grams 2. We then recorded it into a table 3. We then measured out the concentration of glucose solution, they included: 0 molars 0.2 molars 0.4 molars 0.6 molars 0.8 molars 1 molar 4. We poured each solution into beakers 5. Then we placed the potato in each beaker of different glucose concentration st the same time to make sure it was a fair test and left it overnight for the osmosis to take place. 6. The next day we then took each piece out of the glucose solutions individually and dried them using a paper towel thoroughly. 7. We then re-weighed each potato and recorded our results. DIAGRAM BEAKER POTATO 20g Solution PRECAUTIONS * As I stated before I had to keep all the non-variables the same to provide a fair test, and to make sure that they didn't affect the experiment in any way possible. * I had to ensure that when I was cutting the potato I concentrated fully so not to cut myself in the process. ...read more.

Conclusion

I will control this by adding each potato at the same time into each solution so that the outcome result will be reliable. The factors that we will not be able to control are the amount of oxygen that is contained in the experiment. It may have some affect on our outcome result. Scales: These will be used to measure the potato RANGE OF READINGS 0 molars 0.2 molars 0.4 molars 0.6 molars 0.8 molars 1 molar In these different concentrations of glucose the solution is built up by glucose and distilled water. If the concentration consists of 0.2 molars then the solution will contain 0.8 molars of distilled water. It is built up to make 1 molar. So 0 molars will contain 0 molars of glucose but 1 molar of distilled water. It is similar for 1 molar. It will display this to make it easier to understand. I chose this range of readings because it will then give me an even insight of what actually happens when osmosis in potatoes takes place. The range will give me a precise and reliable reading and I will be able to find whether the amount of osmosis taken place in the potatoes decreases or increases as the amount of glucose concentration increases in molars. Therefore showing negative correlation. I do not need to plot any graphs to prove my results. ...read more.

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