Diffusion is vital to many life functions of a cell, it allow the transportation of vitally important nutrients and compounds without the expenditure of excess metabolic energy. To explain diffusion, it is as if a bottle of perfume is opened at one end of the room, then in a short amount of time a person at the other end of the room can detect the scent of the perfume; this is the process of diffusion. Diffusion is a movement from a higher concentration to a lower concentration. A special kind of diffusion is known as osmosis, osmosis is fundamental in many industrial processes such a water purification, desalination, and waste material treatment.
By filling dialysis tubing with different concentrations of sucrose solution and leaving them in water over a period of time a pattern could be observed. Using this information, another experiment was conducted with potato cores submerged in sucrose solution to further examine osmosis.
There were no direct correlations between the findings of both experiments.
Therefore, the effect of osmosis is uncorrelated with the kind of solute, but only with the water content of the two solutions. Introduction Both labs tested the percent change in mass when osmosis occured. The first lab used dialysis tubes with a variety of sucrose concentrations.
When placed in a beaker of water, the tubes were expected to swell with water. This is known as a hypotonic solution. In comparison, a hypertonic solution is just the opposite; the cell has a lower concentration than the solution surrounding it Campbell Biology 76 so water will flow out of the cell in order to create equilibrium, or a balance between the solute substance being dissolved and the solvent dissolving agent.
Campbell Biology 27 The will cause the cell to shrivel up. The second lab tested the osmosis from a beaker of water to a small wedge of potato with different concentrations of sucrose. The concentrations were unknown and it was up to us to infer which one was which. Diffusion is the movement of particles from an area of high concentration to low concentration.
Campbell Biology 75 A more specified form of diffusion is osmosis, what was primarily focused on in this lab, and it is the movement of water across a membrane, again from an area of high concentration to low concentration. Campbell Biology 76 The main objective of this lab was to obtain a better understanding of osmosis by seeing it in action.
In the first lab, we expected the dialysis tubes with the high concentration of sucrose to swell. In the second lab with the potato wedges, the expected outcome was that the potato pieces placed in the beakers with a higher concentration of sucrose would also swell due to the hypotonic solution it creates.
Our hypothesis was that if a solute has a has a high concentration, it will gain more water than if the solute had a lower concentration. Wootton's AP Biology class. Our experiment was completed with the use of the beakers,dialysis tubing, sucrose solvents and potatoes provided by Mrs.
Due to the large amount of work needed we split the group into various roles: Recorder, Weigher, Grabber, Cleaner. As the time was coming to an end the Grabber would pull the dialysis tubing out of the beaker and dry it off.
The Weigher then proceeded to weigh the bag and give the data to the recorder. As the data was coming in it was immediately inserted into our data tables to ensure that no data would be missed.
After the data was inserted into the data tables the Cleaner began to rinse and dry the beakers and put them back on the tray. After our data was completed and submitted the class data was available to compare our results with other groups in the class. Results Overall, for the first lab our hypothesis was correct, as we submerged the dialysis tubing filled with various solvent concentrations the water would go inside the bag.
Our results from the Distilled Water and 0. After pulling out the distilled water dialysis tubing we observed a slight error in the tying of the knot which may have corrupted our results and allowed water to pass through the top.
Besides our two outliers the data almost forms a linear trend, as the sucrose increases then then so does the final mass of the bag.This apparatus for demonstrating osmosis through visking tubing (otherwise known as dialysis tubing) and is widely used in school.
Visking tubing is a semipermeable membrane that allows small molecules like water to pass through but does not allow larger molecules like sugar.
Osmosis and Diffusion. 11/19/ Glucose passes through the dialysis tubing because it's small enough to pass through. We know this because both concentration in the bag and the water is balanced. In this experiment, osmosis is the process of water passing through the cell membrane from a higher concentration to a lower concentration.
Osmosis is diffusion of water across a semi-permeable membrane. Salt is too big to pass through a cell membrane, but water molecules can fit. Since everything wants to reach equilibrium, the only.
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Osmosis and dialysis are special cases of diffusion.
in solution through dialysis tubing, an example of a selectively permeable membrane. A solution of glucose and Water potential is abbreviated by the Greek letter psi .