Investigate the Water Potential of Potato Cells
Introduction
In my investigation, I hope to determine the water potential of potato
cells. The plant material I will use in my investigation will be
potato chips, which I will cut myself prior to the investigation.
I hope to find the concentration of a solution where the chip stays
the same mass and length, which will tell me that the water potential
inside the cells is the same as the water potential outside the cells.
Background
Osmosis is defined as the movement of water through a semi-permeable
membrane. Semi - permeable membranes are permeable to water but
impermeable to certain dissolved substances. In the case of this
experiment, the sucrose molecules cannot diffuse through the cell
membrane because the sucrose molecules are much bigger than water
molecules.
The water potential of a solution is a measure how dilute the solution
is, and therefore of how readily water will diffuse from this
solution, through a semi-permeable membrane, into another solution.
Pure distilled water has a water potential of zero: the water
potential becomes more negative as more substances are dissolved in
it. When two solutions are separated by a semi-permeable membrane,
water moves from the side with high water potential to the side with
low water potential:
If we dissolve substances in water we lower the water potential of the
solution:-
High water potential Some water potential Low Water Potential
Chip grows Chip stays the same Chip shrinks
Key Variables
o Mass of the chip - I think that the larger the mass of the chip then
the bigger the difference in results will be, therefore I think that
to make experiment more easy it would be best to u...
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...ive
balance to measure the mass, and I could have used a burette or
pipette for volumes of liquids. I also could have used a sharper knife
to cut the lengths of the chips. All of these things would have made
my experiment more accurate. I also could have done a few more
averages and repeats, to decrease the margin of error in my
experiment, making my results more reliable.
For further work, I would like to see if in my experiment I could
actually get the result in my experiment where chip does not change at
all, by putting it in the correct Molarity of sucrose solution. I
would do this by putting it in different concentrations, ranging from
0.1M to 0.4M, and see what happened. I would also like to do the
original experiment again, but using the improvements I listed above,
and see how much of a difference there was in the results with the
improvements.
* Amount of sugar solution in each test tube. * The potatoes have to have the same mass.
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* Note the mass down in the table at the end of the first page.
When I am not using them I will place them away from my experiment and
surface area of the potato chip, first I will put it in the beaker as
the same way as it does potato. I would also widen the range of sugar
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The. So if there is a lot of salt dissolved into water surrounding the organism (in this case a potato chip) then water particles from. other cells are going to attempt to equal the concentration of water. in the solution with the water concentration in the cell. Therefore most of the water from the cells of the potato chipping will change in mass, depending on the concentration of solution.
4. Put each group of potato discs in one of the 6 test tubes and watch
Theatre has heavily evolved over the past 100 years, particularly Musical Theatre- a subgenre of theatre in which the storyline is conveyed relying on songs and lyrics rather than dialogue. From its origination in Athens, musical theatre has spread across the world and is a popular form of entertainment today. This essay will discuss the evolution and change of musical theatre from 1980-2016, primarily focusing on Broadway (New York) and the West End (London). It will consider in depth, the time periods of: The 1980s: “Brit Hits”- the influence of European mega musicals, the 1990s: “The downfall of musicals”- what failed and what redeemed, and the 2000s/2010s: “The Resurgence of musicals”- including the rise of pop and movie musicals. Concluding
there would be no flow of water into or out of the cell so the cell
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In my experiment, I will use an overall volume of 50 cm³ of 2moles of
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