Effect of Concentration on Osmosis
Aim
To find out how the concentration of sucrose solution affects the mass
of the potato chip left in the solution for one day.
Prediction
I predict that when the sucrose concentration is low the potato chip
will gain mass. This is because there will be a higher sucrose
concentration in the potato chip so water will go into the potato from
the solution. I predict that when there is a high concentration of
sucrose the potato will lose mass. This is because there is a higher
concentration of sucrose solution in the solution compared to that in
the potato chip so water from the potato will go into the solution to
even it out.
Osmosis is "the movement of a solvent through a selectively permeable
membrane (as of a living cell) into a solution of higher solute
concentration that tends to equalize the concentrations of solute on
the two sides of the membrane"
Osmosis is the movement of water from high water concentration to
lower water concentration through a selectively permeable membrane.
Selectively permeable membranesare very thin layers of material (cell
membranes are selectively-permeable), which allow some molecules to
pass through them but prevent other molecules from passing through.
Cell membranes will allow small molecules like Oxygen, water, Carbon
Dioxide, Ammonia, Glucose, amino-acids, etc. to pass through. Cell
membranes will not allow larger molecules like Sucrose, Starch,
protein, etc. to pass through.
In my experiment I will have a test tube with a potato chip in. The
outside wall of the potato chip is selectively permeable so it lets
water pass through it but not bigger molecules such as sucrose. In the
test tubes I will put different concentrations of sucrose solution.
When the concentration of the solution is lower than that in the
potato, water will pass through the selectively permeable wall into the
potato.
Potato cells
Sucrose solution
The mass of the potato chip increases
Sucrose molecule
Water molecule
When the sucrose solution is stronger outside if the potato chip water
will move out from the potato chip into the solution.
When the concentration is the same on both sides of the selectively
permeable wall nothing passes through it and the mass will stay the
same.
Plan
Apparatus
Five test tubes
Labels
Ruler
Scales
Tissue...
... middle of paper ...
...hips in each test tube. This would make it more accurate as when I
had two in a test tube if one of them was a long way out it made the
graph not follow the line well when I plotted the averages.
There was one anomalous result at 0.5 mol. I think this was because we
patted them dry when we got them out of the test tubes as we did not
want to weigh there water on the outside of the potato but I think
that we may not have dried them all equally so this anomalous result
may have been due to it having water left on the outside of it.
Also the potato itself was not from the same part of the potato and
was not exactly the same size, although I did try to cut them to 36mm
each.
I could also try the same experiment but with different volumes of
cell tissues and see if the percentage change differed with a bigger
and smaller surface area.
I could now investigate the smaller range near to 0.25 to see the
sucrose concentration equivalent to the potato.
Finally, I could extend the experiment to a more exact level by
looking at the potato cylinders under a microscope, then I would be
able to see the cells in greater detail and draw some more
observational results.
5. A second test tube was then filled with water and placed in a test
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cork borer; we made sure we cut off the edge with the skin on it, as
When I am not using them I will place them away from my experiment and
when to do it etc. This should lead me to good results at the end of
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Equipment Potato, Borer, Beakers, Measuring Cylinder, Stopclocks, Distilled Water, Electronic Balance, Salt solutions of various concentrations. Diagram [IMAGE] [IMAGE] [IMAGE] When we leave the potato in the solution for the allocated time, water
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