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osmosis. If Mrs. Chips stores her product in a container of water, the chips will absorb this water because it has a higher concentration of water molecules

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Introduction

Investigation of osmosis in potato cells Osmosis is the net movement of water across a selectively permeable membrane from a relatively dilute solution to a relatively concentrated solution. Osmosis is the reason for Mrs. Chips' potatoes to swell up or shrivel up due to the excessive/limited amount of water intake by the cells. If Mrs. Chips stores her product in a container of water, the chips will absorb this water because it has a higher concentration of water molecules. This will cause the vacuole to increase in size, pushing the cytoplasm against the cell wall. The cell wall then stretches slightly causing the cell to enlarge. This is what makes a cell turgid. On the other hand, if Mrs. Chips stores her chips in a container of salt water the opposite will happen. The cell will have a more concentrated solution so therefore the cells vacuole will loose water to a surrounding lower concentration solution. The cell membrane pulls away from the cell wall and the cell wall becomes soft. This causes the cell to become withered or plasmolysed. Both these schemes will not supply Mrs. Chips with a working solution to store her chips, to provide her costumers with the tastiest takeaway. We need a solution without a concentration gradient or movement of particles from a high to low concentration: To carry out this suggestion we must first make up some salt solution in a ...read more.

Middle

Use a standard kitchen knife to peel the potatoes and cut each one into an even, equal block . 2. Use a scalpel and ruler to cut the potato into chips. There will then be 15 chips. 3. Take a test tube rack and place in 6 test tubes 4. Use a measuring cylinder to measure out different amounts of salt solution and 40cm3 of distilled water and pour it into the test tubes. 5. Weigh every potato chip on an electronic balance and record the weights. 6. Put 3 potato chips into each test tube. 3 chips are used to create an average which gives a better set of results and more accurate graphs. 7. Whilst waiting set out some paper towels with which will dry the potatoes and draw up a basic table for the results. 8. After several hours drain out the solutions in the sink and place all the chips on the paper towel. 9. Dry each chip with the paper towel and then place each one on the scales so to weigh them. 10. Measure each potato on the scales accurately and then record the weights. During the experiment we had to keep safety in mind. While cutting the potatoes we had to take extreme care and precision not to harm ourselves and others but also to cut the potatoes accurately and equal. ...read more.

Conclusion

This means that water molecules will leave the cell which makes the cell plasmolysed. We wanted to find a concentration gradient at an equilibrium which we found to be 0.175% of salt solution. This is the pint on the graph when the gradient passes over the x axis and there is no change in mass, therefore no osmosis occurs. There is no change in mass, as you can see in the diagram, because there is a horizontal concentration gradient and both concentrations in the cells solution and the surrounding solutions are the same. The results we recorded were all done accurately. We dried of the potato chips so that there was no excess water to make the mass increase. The results were mostly similar but in the test tube that contained 3% salt solution, one of the potato chips increased in mass although we did expect it to decrease in mass because the cell was more dilute compared to the surrounding solution. All our other results were accurate. * To ensure we created a fair test we made sure there was * The same volume of solution in each test tube * The same size of potato chip in each test tube * Three potato chips in each test tube * The same time period used for each investigation I was very pleased with all y results through the experiment as they were mostly accurate and they created a suitable solution for Mrs Chips to store her chips. ?? ?? ?? ?? ...read more.

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