The Effect of the Concentration of a Solutionon on the Rate of Osmosis in Potato Chips

The Effect of the Concentration of a Solutionon on the Rate of Osmosis in Potato Chips

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The Effect of the Concentration of a Solutionon on the Rate of Osmosis in Potato Chips


The Variables

The variables in this experiment are; -

· Concentration

· Temperature

· Amount of solution

· Amount of Potato

· Type of Potato

The variable I am going to investigate is concentration

Background Knowledge

The topics that I have studied on osmosis are: -

· Osmosis

· Osmosis in plants

· Turgidity

· Plasmolysis

Fair Test

To make this experiment a fair test I must: -

· Have the same amount of solution throughout the experiment

· Keep the temperature of the solution the same

· Amount of Potato the same

· Type of potato the same

I must keep all these factors the same throughout my experiment to
make it a fair test. I will make my measurements as accurate as
possible and will repeat each solution 3 times.

Preliminary Experiment

To decide the measurements and the strength of concentration in my
experiment I had to do a preliminary experiment. In my preliminary
experiment I set up 6 test tubes each containing a different
concentration of sugar solution. I set this up so in my final
experiment I could se that all these concentrations made an effect and
would give me a clear difference in results. I also decided on an
amount of solution for my experiment. I decided on 30ml. This covered
the chip well and didn't waste the solution. I then added my weighed
and measured chips using the venier callipers and electronic weighing
scales. This gave me an accurate reading in my measurements making my
result more accurate. Once they were added I started the stopwatch and
timed 30minutes. After 30 minutes I re- weighed and measured the
potato chips.

Apparatus

These are the items I will need for my experiment: -


· Potato

· Goggles

· Potato Borer

· Lab Coat

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"The Effect of the Concentration of a Solutionon on the Rate of Osmosis in Potato Chips." 123HelpMe.com. 23 Apr 2019
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· Test tubes

· Test tube Rack

· Distilled water

· Sugar Solutions

· Vernier Callipers

· Weighing Scales

· Thermometer

· Stop watch


Prediction

I predict that if you place a weak potato chip in a strong solution
the weak solution will pass out off the potato and into the strong
solution making the whole thing neutral - Plasmolysis. If you reverse
the situation and have a strong potato chip in a weak solution the
weak solution will go into the potato, thus make the potato gain in
weight - turgidity

Linking Prediction with Theory

I am going to first look at osmosis. Osmosis is the passage of water
molecules through a partially permeable membrane. If water molecules
pass from weak solution to a strong solution with the result making a
neutral solution, then the cell becomes turgid. If a weak solution
passes out of the cell to a strong solution to again make the solution
neutral, then the cell becomes plasmolsed.

Osmosis also occurs in plant cells. Osmosis is the way in which many
living things take up water. When osmosis happens in plants the cell
membrane acts like partially permeable membrane. The cell sap inside
the vacuole is the strong solution. When water passes through by
osmosis the concentration of the sap inside the vacuole is now
neutral. The diagram shows this.

Plasmolysis is when plant cells are placed in strong solutions water
passes out of the cells by osmosis. As water passes out of the cell,
the sap vacuole starts to shrink. These cells are no longer firm. They
are limp. We say that these cells are flaccid. As more water starts to
leave the cell the cytoplasm starts to peel away form the cell wall.
These cells are plasmolysed.

Turgidity is when a plant cells are places in a weak solution. The
weak solution enters the cell by osmosis. This happens because the
cell sap contains a strong solution. The cell membrane again acts as
the partially permeable membrane. The cell begins to swell up as water
enters the cell. The water then starts to push against the cell wall
and soon the cell contains as much water as it can hold. The strength
in the cell wall stop it from bursting. We now say that this cell is
turgid.

Procedure

· Get lab coat and goggles.

· Put them on.

· Collect all the apparatus needed for experiment.

· Set up equipment

· Cut the chips out of the potato using the potato borer

· Measure them using the venier callipers and weigh them

· Record these measurements

· Measure out 30ml of solution.

· In 'A' place the distilled water.

· In 'B' place the 0.2% sugar solution

· In 'C' place the 0.4% sugar solution

· In 'D' place the 0.6% sugar solution

· In 'E' place the 0.8% sugar solution

· In 'F' place the 1% sugar solution

· Place the measured chips in each test tube remembering to mark the
tube to tell you which chip is where

· Leave for 30 min

· Take the chip out of the test tube.

· Blot it dry

· Re- measure the chip in weight and length

· Record your results in a table

· Repeat the experiment 3 times.

Safety

When carrying out this experiment I must:

· Wear a lab coat and goggles at all times.

· Keep my hair tied back

· Have my bag and stool trucked under the table

To make my experiment I must maintain all these safety aspects.

Measurements

In this experiment I must measure: -

· The temperature

· The time

· The amount of solution

· The potato chips weight and length

I must try throughout this project to make my measurements as accurate
as possible.

Now that I have my averages I am going to plot my graph.

Conclusion

My graph is curve. The results and curve of my graph tell me that as
the concentration increases the more water that is released from the
potato chip. Also as the concentration decreases the more water that
is taken in by the potato chip.

All of this occurs because of turgidity and Plasmolysis. These are the
two effects of osmosis. In the lower concentration the potato chips
become turgid because inside the potato chip there is a high
concentration and the low concentration passes through to neutralise
this. So the potato gains weight. (Turgidity) In the higher
concentration there is a weak solution in the potato chip so the water
moves form the potato into the solution trying to neutralise the
solution. So the potato losses weight. (Plasmolysis)

Evaluation

Overall our experiment went well. We collect all of our results in the
time allowed and we had no anomalies. I think that our method of
collecting the results was good but there were a few faults. When we
were taking the results we didn't check the temperature to make sure
they were all the same, our measurements were done using the human eye
and may have not been correct. Also when we were re-measuring we
needed to make sure that there was no excess liquid present and on
some we didn't adding weight to the chip. Lastly when adding the chip
to the solution some may have been added before others giving more
time for osmosis to happen in some. To improve our experiment we could
use a gradual pipit that measures accurately. Also we cloud have
placed our test tubes in a water for the whole experiment keeping them
at a steady temperature. We could also take more time at the end to
fully dry the potato chip before weighing so that all the excess
liquid has been removed. To gain further evidence on this topic I will
go on science investigates and compare my results to theirs. Their
results will have more accuracy so it will be good to compare my pilot
investigation to their wider investigation.
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