Methods for Effect of Osmosis on Potato Cells
Six solutions of different concentrations of NaCl were created by diluting the stock 1 M NaCl solution. The six concentrations were: 0 M, 0.2 M, 0.4 M, 0.6 M, 0.8 M and 1 M. After that, six 250 mL beakers were filled with 100 mL solutions of each different concentration. Then, a cork borer was used to take six equally sized and shaped cylinders from the middle of a whole potato, then the pieces were cut, to attain one unified length for each of the six cylinders. Each potato cylinder was weighed, the weight was recorded, and then each one was dropped into one of the six different solutions. After 45 minutes, the potato cylinders were removed from the solutions then weighed and recorded again, checking for any changes in firmness, length and weight. Other groups did the same experiment but with different solvents: glucose and sucrose and then all results were compared and analyzed.
Results for Effect of Osmosis on Potato Cells: 0 M
0.2 M`
0.4 M
0.6
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In this experiment, with the increasing concentration of NaCl, the potato began shrinking and losing mass in the form of water due to this concentration gradient effect. At 0 M and 0.2 M of NaCl, there was more water outside the potato cells than inside, due to the solution being pure water, which created a hypotonic environment. This caused water to enter the cell at a higher rate than it could exit, resulting in increased intracellular pressure, and causing the cell to swell up and increase in weight. At 0.4 M, 0.6 M, 0.8 M and 1 M of NaCl, there was more water inside the potato cells than outside, due to the abundance of sodium chloride outside of the cell. This caused water to exit the cell at a higher rate than it could enter, creating a hypertonic environment and resulting in cell
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.
Conclusion In my conclusion, the potatoes with the lowest concentration gained the most mass, and would become hard relating back to the Turgor theory I stated earlier. In contrast to this, the potatoes in the most concentrated solution lost the most weight thus becoming plasmolysed and limp also relating back to the background I have mentioned earlier. Evaluation In general the experiment was succesful the results were consistent and also were in accordance with the theories made at the start.. The experiment could have been improved by: · More subjects used instead of potatoes · More potatoes · Wider time ranger · Different molarities Using this variety of methods could have improved the experiemnt, however I was generally satisfied with the results of this osmosis experiement.
The experiment is aimed at giving a better understatement of osmosis process and the different conditions in which osmosis occurs.
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
To investigate the osmotic effect of changing the concentration of sucrose solution; distilled water, 20% sucrose solution, 40% sucrose solution, 60% sucrose solution on the change in mass of potato cylinder after 30 minutes of being in solution.
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 the Effect of Sugar Solution on the Weight and Size of Potato Cells Aim: To investigate whether the different concentration of sugar solution will affect the weight and size of the potato cells. General background information: Osmosis is defined as the movement of water or any other solution's molecules from an area in which they are highly concentrated to a region in which they are less concentrated. This movement must take place across a partially permeable membrane such as a cell wall, which lets smaller molecules (E.g. water) through but does not allow larger solute molecules to pass through. The molecules will continue to diffuse until the area in which the molecules are found to reach a state of equilibrium, meaning that the molecules are equally distributed throughout the cell, with no area having a higher or lower concentration than any other hence equal. Hypothesis/prediction: For this particular investigation I believe that the lower the concentration of the sugar solution in the test tube the mass of the potato will be greater and the longer the potato cells will be.
When I am not using them I will place them away from my experiment and
Introduction It is a process where a fluid will transport itself through a semipermeable membrane, going from an area low in concentration of solute e.g. salt, to an area where the solute is a higher concentration. After this has taken place it ends with there being equal amounts of fluid on either side of the barrier that makes a state known as isotonic. Plants have a strong and rigid cell wall that is on the outside of the cell membrane which is what stops the cell from opening when water is absorbed into it by osmosis. Osmosis causes the cell membrane to become even more rigid and inflated. Osmosis in animal cells is where it will shrink and become crinkly due to any water that is leaving the cell continuously, and if it carries on entering
== = 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.
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.
water in the potato, then the water will go out of the potato and into
The variables I could change would be the temperature of the solution. The higher the temperature of the solution the more osmosis would occur. The surface area of the potato strip, the larger the surface area the more osmosis would occur as there would be more area exposed for osmosis to take place. The concentration of the solution will affect osmosis, the higher the concentration the less osmosis would take place. The duration of the experiment also affects how much water is gained/lost by osmosis as the longer the duration is, the more osmosis would take place (osmosis would stop as soon as it reaches an equilibrium of water content inside and outside the cell.