How does the concentration of sucrose affect the weight
of pieces of potato after osmosis has taken place?
Aim
The aim of this is experiment is to investigate how much sucrose is in
a potato. We are going to investigate the effect of different
concentrations of sucrose on the weights of pieces of potato after
osmosis has taken place.
Prediction
I predict that the less concentrated the solution of sucrose is, the
greater the weight of the potato will be. I predict this because
osmosis is the movement of water from a region of high water
concentration to a region of low water concentration through a
semi-permeable membrane i.e. the cell wall of the potato. If the
concentration of water inside the potato is high then the water will
pass out through the cell wall, decreasing the weight of the potato.
If the concentration of water outside of the potato is high then the
water from outside of the potato will pass through the cell wall into
the potato, thus increasing the weight of the potato. A low
concentration of sucrose will have a greater ratio of water to
sucrose, so more water will pass thorough into the potato in an
attempt to even up the amounts of water and sucrose on both sides. If
the concentration of sucrose outside of the potato is high then there
will be less water to pass through into the potato and the potato will
therefore lose water from inside in an attempt to even up the
concentrations of sucrose and water on both sides. If the cell has
lost water then it will not weigh as much as a cell full of water as
the cell will be flaccid. If the cell has gained water then it will be
turgid and will weigh more. The higher the concentration of the sugar
solution, the faster osmosis will take place. I think this because the
more sugar in the water, the longer it will take for it to balance
out.
Some background information
Osmosis is the movement of water from an area of high concentration
(lots of water particles) to an area of low concentration (few water
particles). It is only the movement of water, as only water particles
are small enough to pass through the semi-permeable cell membrane of
the plant. Osmosis makes plants cells swell up if they are surrounded
by a weak solution i.e. a lot of water, and they therefore become
turgid. This is useful in giving support for cells and opening
stomatal guard cel...
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...in that will affect the next measurement. Our
results were also left by a window, so the temperature could have been
affected if the window was open or the weather outside was hot. To
improve this experiment next time we can also make sure that we leave
the test tubes in the test tube racks nowhere near anything that will
affect the temperature i.e. a heater or a window.
The conclusion may only be valid only within a certain range, if we
were to use even more precise concentrations of sucrose solution then
we can eventually find out the precise concentration that provides the
correct answer. The concentrations used were slightly too vague as I
had to say that the answer must lie between two amounts. However, if
we were to improve the experiment by narrowing down the concentrations
we will use even more then this will be time-consuming and very
tedious. Therefore, it will not be a good idea to try and improve the
experiment in this way.
To extend this investigation we can also experiment changing the
following variables:
Þ Temperature of the experiment
Þ Surface area of the pieces of potato
Þ Weight of the potato
Þ How long the experiment is left for.
Investigate how the Concentration of Sucrose Solution affects the Mass of the Potato Chip Aim To find out how the concentration of sucrose solution affects the mass of the potato chip left in the solution for one day. Water Potential: The water potential of a solution is a measure of whether it is likely to lose or gain water molecules from another solution. A dilute solution, with its high proportion of free water molecules, is said to have higher water potential than a concentrated solution, because water will flow from the dilute to the concentrated solution (from a high potential to a low potential). Pure water has the highest possible water potential because water molecules will flow from pure water to any other aqueous solution, no matter how dilute. Prediction: Osmosis is the passage of water molecules from a weaker solution to a stronger solution, though a partially permeable membrane.
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