StudentShare solutions
Triangle menu
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.

Diffusion and Osmosis - Lab Report Example

The cell and its extracellular environments are fluid in that concentrations of substances dissolved in it vary. Depending on varying concentration of the substances dissolved in water, be it extracellular or intracellular, dissolved substances or water move from one compartment to another directed by physical principles of gradients. To accomplish this, the cell utilizes the processes of osmosis and diffusion as appropriate. These phenomena can be visualized outside the cell by simulating these in vitro. Since cell membrane is a semipermeable membrane and exchanges occur through this, these experiments must utilize a construct of the semipermeable membrane that can be made with a commercially available dialysis tubing and bag. These membranes have microscopic pores through which small molecules like water can pass, but larger molecules, such as sugar cannot pass through them. Thus through this molecular net, solutions of different solute concentrations can be observed to pass in a measurable fashion. This experiment has been designed to prove the hypothesis of the mechanisms of osmosis and diffusion through such a semipermeable membrane.
Diffusion is defined as the movement of molecules from a site of higher concentration to that of a lower concentration. Technically speaking, this difference in concentration creates a concentration gradient, and the steepness of the gradient determines the rate of diffusion. In an attempt to find out the reason as to why it occurs, it can be attributed to a great deal of space between the molecules of all substances that are candidates for diffusion. Liquids have moderate intermolecular space. Moreover, all molecules are in a state of constant random movement so that they collide and intermingle. It is expected that in solids diffusion would occur slowly for tight packing of the molecules. Liquids and gases would diffuse freely because their molecules are spaced widely. Thus, it can be stated that any solute will tend to uniformly occupy the entire space available to it. This movement, known as diffusion, is due to the spontaneous Brownian random movement that all molecules experience. The net result of diffusion is the movement of substances according to their difference in concentrations, from regions of high concentration to regions of low concentration. Diffusion is an effective way for substances to move short distances. Diffusion across a membrane has no preferential direction; it can occur from the outside of the cell toward the inside or from the inside of the cell toward the outside. It is however determined the extend of permeability through a membrane, which in the case of a living cell is the protein-lipid-protein plasma membrane, and therefore, diffusion across the membrane usually implies that the diffusing solute enters the lipid bilayer to cross it, the solute's solubility in a lipid solvent compared with its solubility in water is important in determining its permeability through it. Hydrophilic substances, such as ions and sugars, do not interact well with the lipid component of the membrane, hence would diffuse across the membrane more slowly. This is, however, not applicable in physical membrane such as a dialysis membrane (Campbell NA, Reece JB, Mitchell LG., 1999).
If equal volumes of pure water and a strong sugar solution are taken, the pure water will have more water molecules and would have higher water concentration that a sugar ...Show more
Cite this document
  • APA
  • MLA
(“Diffusion and Osmosis Lab Report Example | Topics and Well Written Essays - 2500 words”, n.d.)
Retrieved from
(Diffusion and Osmosis Lab Report Example | Topics and Well Written Essays - 2500 Words)
“Diffusion and Osmosis Lab Report Example | Topics and Well Written Essays - 2500 Words”, n.d.
  • Cited: 0 times


For a cell to survive, the exchange of water from outside to cell to inside and vice versa is extremely important since water serves as the medium for transport of metabolic ingredients and byproducts. It can occur mainly through two biophysical processes, osmosis and diffusion…
Diffusion and Osmosis Lab Report
Read Text Preview
Save Your Time for More Important Things
Let us write or edit the lab report on your topic
"Diffusion and Osmosis Lab Report"
with a personal 20% discount.
Grab the best paper

Check these samples - they also fit your topic

Osmosis Lab Report
Osmosis and diffusion are the very essential at both the organ and cellular levels. Osmosis is the movement of the solvent molecules from the region of higher concentration to the region of lower concentration through a semi permeable membrane.
4 pages (1000 words) Lab Report
Diffusion and Osmosis
Since the cell membranes represent semi-permiable membranes, the processes of diffusion and in particular, osmosis, are clearly evident. The importance of these two processes is based on the fact that they determine the distribution of nutrients and the disposal of waste products of metabolism.
4 pages (1000 words) Lab Report
Lab Report
Since 19th century scientists were aware of some unique identity of an individual which distinguish from others, like finger prints. In 1970, DNA was established as key element in human life and which makes individual as unique creature. Variability in DNA sequences among individual to individual have attracted forensic experts to develop technique based on DNA to identify individual or criminal similar to finger prints.
9 pages (2250 words) Lab Report
Lab report
Then place another clamp with a 200-g suspension and repeat the same previous step. Record positions with respect to the points of support and of the weights used. Empty the meter stick of clamps and
3 pages (750 words) Lab Report
Lab Report
1. E. coli is in competition with S. euglensis at a temperature of 20-35 degrees and a pH of 6-7.5. E. coli is also in competition with N. atol at a temperature of 20-30 degrees and a pH of 4.5 -6.5. P.
1 pages (250 words) Lab Report
Lab Report
Calcium phosphate has greater healthy benefits. Most of the people suffering from tooth decay opt for homemade procedural toothpaste using calcium
1 pages (250 words) Lab Report
Lab report
For the first cycle, the mass of the water alone is the mass of the crucible lid and hydrate, less the mass of the crucible lid and residue after heating. That gives 22.678 – 22.460 = 0.218. The mass of the hydrated salt is the mass of the crucible lid and hydrated salt, less
1 pages (250 words) Lab Report
Lab report
o calibrate the pressure transducer and then perform an uncertainty analysis and compare your pressure transducer calibration to the manufacturer’s calibration. 1. Excite the pressure transducer, with a voltage of 10v. The figure above had J17 and J18 as AO (Analog Out). It
5 pages (1250 words) Lab Report
Lab Report
From this mode, the shortest side of the triangle was represented by the distance between thumb nails (D), while the longest distance represented the distance from the ruler
2 pages (500 words) Lab Report
Lab report
For this experiment a cuvette, calorimeter, and a color of your choice for the dye solution, A.To begin the experiment, clean the cuvette. Wash out the cuvette three times with water, and then three times with solution. Once
3 pages (750 words) Lab Report
Comments (0)
Click to create a comment
Let us find you another Lab Report on topic Diffusion and Osmosis Lab Report for FREE!
Contact us:
Contact Us Now
FREE Mobile Apps:
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us