Osmosis in Potato Cylinders
Aim: Trying to find the average sugar concentration in the potato
cylinder cells.
I will use potatoes for my experiment because they are convenient and
shows fast results in osmosis.
[IMAGE]The diagram to the right shows a basic plant cell, however, the
difference between this diagram and the potato cells I will be using
is that the potato will not be green as it does not need chlorophyll.
The cell membranes in a potato cylinder are partially permeable; this
means that only particles that are the right size can diffuse through,
basically if the particle is too big it will not fit. Osmosis occurs
when there is a higher concentration of particles on one side of the
cell membrane than on the other. This will lead to the water particles
diffusing from an area of higher concentration to an area of lower
concentration.
[IMAGE]The diagram to the right shows a partially permeable membrane.
There is a higher concentration of water on the left side of the
membrane. This means that the diffusion will cause the water particles
to move from the left side to right side of the membrane.
Variables:
The variable that I will keep constant is the length of my potato
cylinders which will be kept at 4 cm. I will keep it the same length
so as to avoid a greater or less surface area. I will also keep the
volume of solution and the length of time the same to ensure reliable
results
The variables that I will change are the concentrations of my sugar
solution.
Finally my resultant variable will be the length changed of the potato
cylinders.
Prediction: I will make three predictions for this experiment, they
are as follows:
1. When the potato cylinder is placed in a solution with a high
concentration of sugar, the potato cylinder will decrease in size
due to the water particles diffusing into the sugar solution.
Furthermore, using a graduated cylinder with markings below the 100 mL line would have allowed for more accurate measurements of the initial volume of air in the graduated cylinder.
osmosis, it can works both ways so that it can pass into and out of
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.
The Effect of Water Concentration on the Mass of Potato Tissue Aim: The aim of this investigation is to discover the effect of water concentration on the mass of potato tissue, and also to investigate the movement of osmosis through potato tissue. Scientific Knowledge: When a substance such as a sugar dissolves in water, the sugar molecules attract some of the water molecules and stop them moving freely. This, in effect, reduces the concentration of water molecules.
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.
· The same diameter corer is used so to keep the surface area of each
* Note the mass down in the table at the end of the first page.
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
there would be no flow of water into or out of the cell so the cell
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