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Osmosis
Aim: -
To investigate the factors that effect the osmosis in potatoes.
Introduction: -
Osmosis is the movement of water through a semi permeable membrane, separating solutions of different concentrations. ...
Many cell membranes behave as semi permeable membranes, and osmosis is a vital mechanism in the transport of fluids in living organisms, for example, in the transport of water from the soil to the roots in plants.
If a cell is in contact with a solution of lower water concentration than its own contents, then water leaves the cell by osmosis, through the cell membrane. ...
If you put a plant cell in water, water enters by Osmosis, then swells up. ... When the potato chip is put into the solution, it will, by osmosis lose some of its water, and the water will diffuse into the solution of glucose, causing the potato chip to lose water, therefore decreasing in weight and length. ... The reason for the minus results for 1 molar concentration is that the solution has a lower concentration of water to that of the potato, and so, by osmosis water moves from the potato to the solution, causing the weight to decrease. ...
Fair test: -
All these factors will have to be kept constant except the sugar concentration whilst doing the experiment to ensure that the investigation is a fair test:
q Length potatoes- so that there is the same length of potato for osmosis to take place in. ... This will allow us to see whether osmosis has taken place, and to what extent. ...
1) Temperature – The warmer the solution, the quicker the osmosis will go. ...
2) Difference in concentrations – This will speed up the rate of osmosis because there will be more particles that’ll have to change places.
3) Surface Area – This will speed up the rate of osmosis because there will be more space on the potato for osmosis to take place.
4) Concentration of water in potato – the higher the concentration of water in the potato the quicker osmosis will happen because less water will have to diffuse into the potato to even the amounts of water inside and outside the potato.
Preliminary Experiment: -
In this preliminary experiment I will investigate the factors that affect the osmosis in potatoes. ... This would mean I would obtain precise and reliable results in my main experiment when investigation the factors that effect the osmosis in the potatoes. ... 81
Analysis Of Graph: -
The graph shows the line of best fit for the average weights of potato chips before and after Osmosis in different concentrations of sucrose solution. ... This graph shows that the average weight after Osmosis and the concentration of sucrose solution are not directly proportional. ... I also think that I gave the experiment enough time for Osmosis to occur. ... I could extend this investigation by investigating osmosis with a different factor as opposed to concentration of water. I could investigate the effects of temperature on osmosis, or surface area. This would give me a very clear understanding and knowledge of osmosis in potatoes. ... This means, that as the concentration of glucose increases in a solution, the concentration of water decreases, lessening the solution’s water potential, and lessening its ability to move between solutions by osmosis.
Approximate Word count = 2751
Approximate Pages = 11
(250 words per page double spaced)
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