The Investigation of Osmosis in Potato Chips
Osmosis will occur across a semi-permeable membrane whenever there is
a difference between the water concentrations on the two sides of the
membrane, and when this happens to cells they will either become
turgid if water flows into them, or plasmolysed if water flows out of
them, and therefore changing their mass.
Aim:
To investigate how changing concentration in a sugar solution affects
the rate of osmosis in potato chips.
Prediction:
I predict that as potato chip is placed in a solution of high water
concentration then the potato chips will increase in weight and if put
in a low concentration then it will do the opposite.
If the concentration of a solution into which a potato chip of 2cm of
a potato is placed is greater than a certain level the potato chip
will contract, and if the concentration is less than that level it
will expand. This can be seen in living cells.
The cell membrane in cells is semi-permeable and the vacuole contains
a sugar/salt solution. So when a cell is placed in distilled water
(high concentration of water), water will move across the
semi-permeable membrane into the cell (lower concentration of water)
by osmosis, making the cell swell. This cell is now turgid. If this
were done with potato cells the cells would increase in mass because
of the extra water. If these potato cells were placed in a solution
with a low water concentration, then the opposite would happen. Water
would move out of the cell into the solution. In extreme cases the
cell membrane breaks away from the cell wall and the cell is referred
to as plasmolysed. The potato cells will have decreased in length,
volume and mass.
The greater the concentration of water on the out side of the cell the
greater the amount of water that enters the cell by osmosis. The
smaller the concentration of water out side the cell the greater the
amount of water that leaves the cell.
However, since the distilled water carries no sugar molecules, I think that the potato chip will gain water to create a balance between the two sides of the cell wall, making it gain mass. Scientific background: Osmosis is the diffusion of water molecules through a selectively permeable membrane from a region of high water concentration to a region of low water concentration. The direction and rate of osmosis depends on the difference in water concentration between the two sides of the membrane. Water will still move into an area of lower water concentration until the two concentrations are equal. Weak Solution.
Potato cells, diffusion, osmosis, and tonicity by Michaela Cupp. Science Experiment Topic: Which solution will help absorb the red dye into the potato cells, pure water or 50% salt water? Related research topics/terms: Diffusion, Osmosis, Tonicity are things I found during my experiment. An explanation of the links between the topics:
is put in pure water it will become turgid and it will not burst due
This will be done by the potato being cut in exactly the same shape and size. The water affects the osmosis and the rate of osmosis. The variation of osmosis could differ whether it's a high concentration or a low one. The concentration of the solution is measured in Molar; the amount of Molar will also affect the solutions concentration. The thickness of the membrane over which the osmosis is happening also affects the rate of osmosis, because the free water molecules need more energy to pass through the membrane the thicker it is fewer
The Effect of Solute Concentration on the Rate of Osmosis Aim: To test and observe how the concentration gradient between a potato and water & sugar solution will affect the rate of osmosis. Introduction: Osmosis is defined as, diffusion, or net movement, of free water molecules from high to low concentration through a semi-permeable membrane. When a substance, such as sugar (which we will be using in the experiment we are about to analyse), dissolves in water, it attracts free water molecules to itself, and in doing so, stops them from moving freely. The effect of this, is that the concentration of (free) water molecules in that environment goes down. There are less free water molecules, and therefore less water molecules to pass across a semi-permeable membrane, through which sugar molecules and other molecules attached to them are too big to diffuse across with ease.
Osmosis Experiment Planning Aim: The main subject that I will be planning to investigate is the effects of a concentrated sucrose solution on potato cells on the basis of the Osmosis theory. Background knowledge: The plant cell and its structure To understand osmosis in detail I will need to explain the plant cell (which is the cell included in the osmosis experiment) and its cell membrane. Below I have a diagram of a plant cell: [IMAGE] Osmosis is about the movement of particles from a higher concentrated solution to a lower concentrated solution to create an ethical balance via a partially or semi permeable cell membrane. Osmosis in simple terms is the exchange of particles between the cytoplasm inside the cell and the solution outside the cell. What makes this exhange is the partially permable cell membrane.
I would also use what I have concluded at the end of the experiment to
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.
I am going to carry out an experiment to measure the change in mass of
If a plant cell is places in a hypotonic solution the cell has a lower water concentration to that of the solution. Water will move into the cell by osmosis from a high water concentration outside the cell to a lower water concentration inside the cell through a selectively permeable membrane. The cell becomes turbid
At point A the graph shows that no change in mass, of the potato, would have have occurred had we used a 0.2 (m) sucrose solution. This suggests that the concentration of water inside the potato would have been equal to the solution outside the potato. At point B (plain water), there is no indication that the cell is increasing in mass. This is because the cell is fully turgid and no more water can enter.
Osmosis in Carrots Background Osmosis is the diffusion of water from a dilute solution to a more concentrated solution through a partially permeable membrane, which allows the pass of water molecules but not solute molecules. [IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE][IMAGE]If a cell is placed in a less concentrated solution water enters because the less concentrated solution will have a high concentration of water than the inside of the cell. Once the cell takes in maximum water the cell becomes turgid. If the cell was to be placed in a high concentrated solution, water would leave the cell because the cell would contain a low concentrated solution. So in the low concentrated solution there will be a high concentration of water and in the high concentrated solution there will be a low concentration of water.
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.
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.
Prediction I think that when the potato is placed in distilled water the potato mass will increase. This is because water, has, if pure, a weaker concentration than the potato, and the water molecules move in through a partially permeable membrane by osmosis. If the potato is in a high concentration salt solution, the potato mass will decrease because the potato is less concentrated than the salt solution, and the water will move through the partially permeable membrane into the stronger solution. However, if the potato mass stays the same after the experiment, this means that the water/salt solution and the potato must be of equal concentration.