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The effect of osmosis on living cells lab
Investigation of osmosis
Investigation of osmosis
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Osmosis is the movement of water, through a cell membrane, from higher to lower concentration. A solution can be hypertonic, hypotonic, or isotonic when compared to a cell. Hypertonic solutions occur when the solution is more concentrated compared to a cell and the water moves out of the cell and into the solution. Hypotonic solutions occur when the solution is less concentrated compared to a cell and the water moves into the cell and out of the solution. The last type of solution, isotonic, occurs when the solution has the same concentration compared to the cell. The water moves both in and out of the cell when a solution is isotonic. During the lab, the egg represented a cell and how a cell would react to different types of solutions. The three solutions that the egg was placed in were vinegar, corn syrup, and water (distilled). image.png
The egg expanded and the mass of the egg increased after a day of being fully submerged into the vinegar solution. The egg originally had a mass of 60.55g with a white colored shell before being placed into the vinegar solution. When the egg was taken out of the vinegar solution a day later, the egg had a mass of 80.84g and the shell was completely dissolved. The
The process of osmosis changes the volume of water in a cell which changes the size of the cell. The vinegar and distilled water were both hypotonic solutions, so water was added to the egg. As a result of more water entering the egg, the egg would expand. The volume of water in the egg increased, causing the size of the egg to expand as well. The corn syrup was the only hypertonic solution because water moved from the egg, to the solution (corn syrup). This type of solution caused the egg to shrink because water was being taken out, or moved, into the solution. The volume of water in the egg decreased, causing the size of the egg to
This process can also be defined as osmosis, which is the diffusion of water molecules across a membrane. (Unknown, 2) When we first got the egg it would be an isotonic solution meaning that it had equal tension (Unknown,1) which would mean that the same amount was inside the cell as outside of it. The purpose of the experiment was to learn about diffusion, concentration gradient, passive transport, equilibrium, osmosis, tonicity, hypertonic solutions, hypotonic solutions, isotonic solutions, and osmoregulation. If I put the egg in corn syrup, then the egg will deform because it has been placed in a hypertonic solution.
The egg breaks when it is dropped. The eggshell is shattered. The yolk is scramble a little bit.
In osmosis, water can travel in three different ways. If the molecules outside the cell are lower than the concentration in the cytosol, the solution is said to be hypotonic to the cytosol, in this process, water diffuses into the cell until equilibrium is established. If the molecules outside the cell are higher than the concentration in the cytosol, the solution is said to be hypertonic to the cytosol, in this process, water diffuses out of the cell until equilibrium exists. If the molecules outside and inside the cell are equal, the solution is said to be isotonic to the cytosol, in this process, water diffuses into and out of the cell at equal rates, causing no net movement of water. In osmosis the cell is selectively permeable, meaning that it only allows certain substances to be transferred into and out of the cell.
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.
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
The experiment could have gone many ways with different possible results. There are a couple of changes that might be made to make the experiment better. One change would be to use something else instead of bananas for eggs. Bananas have a strong flavor, so maybe using applesauce for oil or avocado for
So what is happening is water is moving from a high concentration, i.e. a dilute solution to a more concentrated solution. Preliminary Work on Osmosis I am going to test carrots in a small osmosis experiment to see how the experiment works with carrots and salt solution and water. Variables 1) Temperature - Keep the same 2) Number of days left soaking - Keep the same 3) Size of beaker - Keep the same 4) Size of carrots - Keep the same 5) Concentration of salt solution -
Objective- The objective was to determine the effect of salt water on a red onion cell membrane, but we are more focused on the actual cells.
Most cell membranes are like that, being permeable to water and some solutes only. Osmosis is therefore the diffusion of water through a partially permeable membrane. The basic principles of diffusion apply here.
In a 100ml beaker 30mls of water was placed the temperature of the water was recorded. 1 teaspoon of Ammonium Nitrate was added to the water and stirred until dissolved. The temperature was then recorded again. This was to see the difference between the initial temperature and the final temperature.
Osmosis: The movement of water molecules across a cell membrane from a less concentrated to more concentrated solution. Filtration: The movement of water and other molecules across a cell membrane caused by blood pressure.
== = This experiment is based on the concept of Osmosis. Osmosis is the diffusion of water molecules from a region of high water concentration to a low water concentration through a semi permeable membrane (in this case, the cell potato cell membrane). The cell walls of the potato cells are semi permeable meaning that water molecules (which are small) can fit through but other bigger molecules such as glucose cannot pass through. The water molecules can flow both ways through the membrane, letting molecules both in and out.
Egg Albumen Experiment The purpose of this investigation is to establish which is the lowest concentration of Copper (II) Sulphate solution that will denature a sample of egg albumen (egg white) at room temperature. The base of the reaction is the globular protein (albumen) being denatured by a heavy metal (Copper (II)), the copper (II) reacts with the NH3 group causing it to denature, this means the proteins' secondary and tertiary structures are being altered and refolding into different shapes, this resulting in a change from the substance being clear to turning opaque.[1] As the concentration of the denaturants increases more folding and changing of shape will occur and therefore more denaturing will occur and at a faster rate. From this I can predict that that lowest concentration of the solution is approximately at 0.03m solution.
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.
, and the volume of H2 is measured. As HCl is in excess, all the