Osmosis

OsmosisThese results show that a potato chip placed in water will gain in length, a weak sugar solution will lose length and a strong sugar solution will lose length also. The results from this test will allow me to choose an appropriate range of moralities in order to find out what the concentration is inside the cell vacuole. I am going to investigate 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0 molar sugar solutions. I have chosen these concentrations to try and accurately find when there is no net movement of water, hence the concentration of the cell vacuole.
From previous work done on osmosis, I predict that molarity and average change in mass/ length will be indirectly proportional. I think there will be a negative correlation between the two. I think that there will be both loss and gain in mass discovered. I think the graph will look like this 89/5489/15489/image005.jpg" align="left" hspace="12">but there will be no plasmolysed on my graph, as I do no expect my measurements to go that far. I hope to be able to identify the point when there is no net movement of water. Analysis of Results
The Consequences of Osmosisin plant cells:
Plant cells always have a strong cell wall surrounding them. When the take up water by osmosis they start to swell, but the cell wall prevents them from bursting. Plant cells become "turgid" when they are put in dilute solutions. Turgid means swollen and hard. The pressure inside the cell rises, eventually the internal pressure of the cell is so high that no more water can enter the cell ??

The type of potatoes themselves will have to be kept the same all the way through the experiment. This is because each potato may have a different membrane and a different amount of pores.
Also the water content in each potato could vary. This can be explained by saying that the potatoes in the middle of the sack will have a higher water content, because it is more humid in the middle of the sack which is opposite to the potatoes on the outside of the sack.
To get rid off this unfairness, I will pre-treat all the potatoes that I will use in my experiment. This means that I will keep all my potato cylinders in the same environment over night in a beaker full of sucrose solution.
When plant cells (potatoes) are placed in concentrated sugar solutions they lose water by osmosis and they become "flacc ?


Visking" tubing is a form of processed cellulose or cellophane which has pores in it through which water (and other small molecules) can pass, so it can be considered as a partially permeable membrane. If it is sealed at one end, attached to a glass tube, and filled with a liquid such as sugar solution, and immersed in another liquid such as water, then water should pass through the visking tubing and cause the level of liquid to rise inside the glass tube.

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