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Investigation into osmosis in potato cells.
Investigation into osmosis in potato cells.
ia on osmosis for potato cells
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Recommended: Investigation into osmosis in potato cells.
Osmosis in Potato Cells
Plan
Introduction
Given that osmosis is the movement of water molecules by diffusion
from a place where the water molecules are in a higher concentration
(high water potential) to a place where the water molecules are in a
lower concentration (low water potential) through a partially
permeable membrane, the experiment to test osmosis in potato cells was
set up. The experiment would prove the theory of osmosis and determine
whether the concentration of water in the solution surrounding the
potato was higher or lower than that of the water concentration inside
the potato. This would cause the potato to become turgid or
plasmolysed.
Diagram of apparatus
Variables and Method
Above all other factors, for this experiment to work it needed to be a
fair test. For this to be possible, all variables had to be controlled
throughout.
Seven separate concentrations of water and sucrose solutions were used
in this experiment with a maximum of 20% sucrose. These were
distributed accurately with the use of measuring cylinders as the
concentrations of water and sucrose held great sway on the dependant
variables, such as the mass or length of the potato at the end. Each
solution had a volume of 20cm and both the temperature and pH were
recorded.
It was necessary that all seven samples of potato had to be the same
length, width and therefore surface area before the experiment began.
This was so equal amounts of solution could make contact with each
potato and that there was the same amount of water inside each potato
to begin with. For accuracy a cylinder shaped cork borer of size five
was used and once all the samples had been pulled out of the potato a
metal rule marked 5cm of length on the potato and the left over were
cut off with a sharp blade. The mass of each potato was then recorded
to two decimal places using the balance so these could be compared
with the end results.
Investigating Osmosis In A Potato Introduction: "Osmosis is typically defines as the flow of one constituent of a solution through a membrane while the other constituents are blocked and unable to pass through the membrane. Experimentation is necessary to determine which membranes permit selective flow, or osmosis, because not all membranes act in this way. Many membranes allow all or none of the constituents of a solution to pass through; only a few allow a selective flow. In a classic demonstration of osmosis, a vertical tube containing a solution of sugar, with its lower end closed off by a semi-permeable membrane, is placed in a container of water. As the water passes through the membrane into the tube, the level of sugar solution in the tube visibly rises.
Investigating the Effects of Varying Sugar Concentration on the Amount of Osmotic Activity Between the Solution and Potato Tubes
Osmosis in Potato Chips Preliminary Experiment to investigate Osmosis 1M Sugar 50:50 0M (water) Initial mass 2.40 2.05 2.34 Final mass 2.01 1.85 2.43 Change in mass -0.39 -0.21 0.09 % change in mass -12.5% -10.5% 3.84% Evaluation From doing our preliminary experiment it enables us to gain a better result for our real experiment. From this experiment we have learnt a few things through trial and error, for example. If we had used a wider variety of concentrations, our results would have been more accurate. By using a syringe to measure the solution we would have also got a more accurate result. We could have also weighed the potato chips more accurately so they were roughly the same size with no skin.
Measuring The Rate Of Osmosis In Potato Cells Skill Area P. Osmosis is defined as free water molecules diffusing from a high concentration to a low concentration through a semi-permeable membrane. Variables - The rate of osmosis effected by many different living things, temperature of the solutions, surface area over which it can occur, Volume of solution, Volume of potato, distance through which the free water molecules have to pass and finally the difference in concentration of the solutions. This final factor is the one that we are going to test during the experiment. The temperature increase causes the cells to expand so the whole potato expands. Different volumes of potatoes at different temperatures could be measured, however trying to measure the temperature of a potato effectively without causing defects in other results would be quite hard with the equipment we are using.
Osmosis in Potato Tubes Osmosis: Osmosis is the movement of water molecules through a semi-permeable membrane from a high concentration to a low concentration. Diagram: [IMAGE] [IMAGE] Aim: To see the effects of different concentration of sugar solution on Osmosis in potato tubes. Key factor: In the investigation we change the sugar solution from: 0%-10%-20%-30%-40%-50% this is the independent variable; the dependant variable is the change in mass. Prediction: I predict that all the potato tubes in pure water or low concentration sugar solution will swell because water enters their cells by osmosis.
* Note the mass down in the table at the end of the first page.
When you place a potato chip in a salt or sugar solution, then if the
potato chips left in a sugar solution for a period of 1 hour. I will
Investigate the Osmosis of Potato Cells in Various Salt Solutions. Introduction I have been asked to investigate the effect of changing the concentration of a solution on the movement of water into and out of potato cells. I will be able to change the input of my experiment. The input variable is the concentration of the solution.
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
An Experiment to Investigate Osmosis in Plant Tissue. Aim: To conduct an investigation to compare the osmotic behavior of the osmotic animal. two types of plant tissue in varying concentrations of sucrose. solution. Then we can find the solution.
I will need 3 pieces of potato in each tube. As there are 6 tubes I
When I am not using them I will place them away from my experiment and
4. Put each group of potato discs in one of the 6 test tubes and watch