Diffusion And Diffusion Lab Report

Osmosis is a natural occurrence constantly happening within the cells of all living things. For osmosis to occur, water molecules must move across a semipermeable membrane from an area of low concentration to an are of high concentration. In order to understand osmosis, people must understand the different types of concentrations that can be present within solution. One of them is an Isotonic solution where the concentration of dissolved particles is equal to that of a cell’s. Another is a hypertonic solution where there is a higher concentration of dissolved particles then inside the cell. And lastly there is a hypotonic solution where there are less dissolved particles than inside the cell. As dissolved particles move to a region of lower concentration, water moves the opposite direction as a result of there being less water in the highly concentrated region. In this experiment, gummy bears were placed in salt water, sugar water, and tap water to find the measure of osmosis between the solution and gummy bear.

2. Once your solutions are made and set aside, you will want to create your simulated cells using dialysis tubing. Fold one end of the dialysis tubing and wrap a rubber band (tightly) around that end to seal it.

The main purpose of the experiment was to test the idea that water would move from the higher concentration to the lower concentration. In order to test this theory, we placed potato slices in 7 different containers, each containing different concentrations of NaCl, to measure the weight change from osmosis. The containers ranged from 0M NaCl all the way to .6M NaCl. We measured the potato slices before and after placing the slices in the solutions and recorded the net change in weight to determine the tonicity of the potato cells. Our results showed that the potato slices put in a NaCl solution of .2M or higher lost weight and the potato slices put in a NaCl solution of .1M or lower gained weight. This shows that the osmolarity of the potato falls within the range of .1M to .2M, and it also proves the process of Osmosis by having the higher concentration move to the lower concentration. In addition to this, it can be concluded that the osmolarity of cells can be determined by observing the affects of osmosis.

7. Explain how incubation plant tissues in a series of dilutions of sucrose can give an

In this experiment, we will investigate the effect of solute concentration on osmosis. A semi‐permeable membrane (dialysis tubing) and sucrose will create an osmotic environment similar to that of a cell. Using different concentrations of sucrose (which is unable to cross the membrane) will allow us to examine the net movement of water across the membrane.

The hypothesis states that if the solution is hypotonic the results will decrease, if the solution is hypertonic the results will increase and if the solution is isotonic the solution will vary and or remain constant. In order to test the predictions of the hypotonic, hypertonic, and isotonic hypothesis for the solution  made during the study,  four samples of sucrose were taken and placed into two different beakers each containing a different concentration. Then dialysis tubing A was placed into beaker 1 with B, C, and D placed into beaker 2 for 45 minutes and weighted at 15 minute intervals. My finding in the study was that each of the four samples changed from their initial weight and for the most part accurately proved the hypothesis.

The main purpose of this lab was to view the process of diffusion. This was to see how a caterpillar digests its food and what exactly happens in the process in regards to amylase, glucose, etc.

Osmosis is the passive movement of water from an area of low solute concentration to an area of high solute concentration, normally across a membrane which prevents the movement of solvent. This is a process by which materials may move into, out of, or within cells. Osmosis doesn’t depend on energy provided by living organisms but is affected by the properties of the cell membrane. The rate of osmosis is dependent on such factors as temperature, pressure, molecular properties such as size and mass, and the concentration gradient. In osmosis, the relationship between a solute’s concentration outside of cell and inside of a cell is described in terms of the tonicity of the solution outside of the cell. A cell is in a hypotonic solution when the solute is more concentrated inside the cell and therefore water moves into the cell. In this solution the cell swells as water enters, this may continue until it ruptures or hemolyzes. In the reverse condition, the cell is in a hypertonic solution

Those three experiments showed that the way onion cells are dealing with the movement of water in and out of the cell is by osmosis. That Osmosis is the diffusion of water across a membrane into a solution having a greater solute concentration. The cell

And the opposed brought water in. Conclusion The lab was a success we were able to show that osmosis is a thing and how it works in side of plant and animal cells, The potatoes and the egg did what was supposed to happen as more and more salt came into the solution the more water was pulled out of the cell and reversed and they were gaining water and adding and lose 20 to 30 g of water weight because of osmosis. If there is more salt in the solution then there will be more and more water pulled out of it. And this was 100% true because that is what happened during the lab.

Another very important pulmonary function test used in various healthcare settings is lung diffusion capacity testing, also known as DLCO. DLCO stands for diffusion capacity of the lung for carbon monoxide, measuring the extent in which oxygen passes from the alveoli of the lungs into the bloodstream. Results of this test are used to help determine the amount of damage to the lungs or abnormality, by answering to how well the lungs can move gases into the bloodstream. This test is performed by having the individual breath in some air containing a very small amount of carbon monoxide and a tracer gas which is usually helium or methane. Physicians will often walk them through the 10 second hold breath technique, where they are asked to hold their breath for 10 seconds after the initial inhalation of the CO/tracer mixture, then rapidly exhale after the time is up.

Cells in all living things have an outer layer known as the cell membrane. The structure of the cell membrane consists of the phospholipid bilayer organized by the arrangement of hydrophilic heads and hydrophobic tails. It is a selectively permeable membrane, where it divides the outer environment from the interior of the cell. It can control substances moving in and out of living cells. Certain molecules like gases, water, and food are permitted to pass the membrane through the method of diffusion. Diffusion refers to the process in which molecules move on the concentration gradient, where they move from an area of high concentration to an area of low concentration. A type of diffusion is known as osmosis. It is the diffusion of water moving across the selectively permeable membrane. In this lab, students will be using eggs to construct an experiment to get a better study on how osmosis works in a cell. The eggs will be soaked in vinegar solution to remove their shells to expose each inner layer that resembles a selectively permeable membrane. The egg shell is composed of calcium carbonate that would dissolves in acidic solution such as vinegar. In the chemical reaction, it releases carbon dioxide gas. After the removal of the egg shell, it will be ready to be able to construct the experiment.

Showing an example of diffusion with the water molecules equally back and forth the semi-permeable membrane of the potatoes and the saucer of water. The hypertonic solution of salt water has given an example of osmosis. The water molecules passed through the semi-permeable membrane out of the potatoes but weren’t able to get back in as easily due to the salt blocking the membranes passage. This left the potatoes in the salt water saucer feeling flexible and spongy almost leaving the potato a little

Osmosis is the movement of water molecules from high concentration to low concentration through semipermeable membranes, caused by the difference in concentrations on the two sides of a membrane (Rbowen, L.). It occurs in both animals and plants cells. In human bodies, the process of osmosis is primarily found in the kidneys, in the glomerulus. In plants, osmosis is carried out everywhere within the cells of the plant (World Book, 1997). This can be shown by an experiment with potato and glucose/salt solution. The experiment requires putting a piece (or more) of potatoes into glucose or salt solution to see the result of osmosis (a hypertonic type of solution is mostly used as it would give the most prominent visual prove of

The cell membrane controls the movement of substances in and out of the cell. Oxygen and food move inside the cell through the membrane in the process of diffusion. Diffusion occurs when cells move from an area of high concentration to an area of low concentration. Osmosis is a type of diffusion; it is a diffusion of water through the cell membrane. Osmosis takes place when water particles move from a more concentrated area to a less concentrated area. For this process to take place there must be a concentration gradient, which consists of two different solutions in each side of the membrane. Hypotonic consists of a less concentrated solution and hypertonic consists of a more concentrated solution. The glucose syrup will be the hypertonic solution, thus the egg will shrink. When the egg is placed in a hypotonic solution the egg will shrink. The egg’s expansion occurs because of the process of diffusion. The egg without the shell will represent the cell and its membrane. The shell of the egg was removed by placing it in vinegar before starting the experiment. The eggshell is made of the mineral calcium carbonate, which dissolves in acids such as vinegar. During this process of dissolving it releases the carbon dioxide gas. After the shell is dissolved only the membrane with remain in the egg. In this case it will be a hypotonic solution because the egg is expanding and there is a higher concentration of water outside of the membrane and a lower concentration area inside,