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.
In my experiment, I will use an overall volume of 50 cm³ of 2moles of
Severson, Kim. "Guns at School? If There’s a Will, There Are Ways." The New York Times.
* Note the mass down in the table at the end of the first page.
cork borer and a ruler. I will keep the potato chips the same size in
Water Potential of Potato Cells Aim: To demonstrate the Water Potential of Potato Cells. Objectives: · To show the water potential of potato cells using various measured concentrations of a sucrose solution and pieces of potato. · To record and analyse data to verify observed results. · The method and procedure was carried out as per instruction sheet. Observations: The experiment shows that the lower the concentration of the sugar solution, in the Petri dish, the mass of the potato increased.
the same way as it does potato. I would also widen the range of sugar
surface area of the potato chip, first I will put it in the beaker as
Hawkins , John . "5 Reasons Marijuana Should Remain Illegal." 21 January 2014. Town Hall. Web. 10 April 2014.
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.
repeat the process 3 times in total to ensure a fair test. At the end
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