What Is The Diffusion Of Diffusion And Osmosis

Diffusion and Osmosis Shown In Solutions

INTRODUCTION This lab, title Diffusion and Osmosis, was centered around the diffusion across a cellular membrane and how exactly materials move and diffuse in concentrations. Both diffusion and osmosis are forms of movement that are part of passive transport dealing with cell membranes. Diffusion is where the solutes move from an area of high concentration to a low concentration. Water goes through the cell membranes by diffusion. Osmosis is specifically the movement of water through membranes. Since osmosis and diffusion are both part of passive transport, this means that they do not require energy or pumps. There are different environments created due to diffusion. There are hypotonic, hypertonic,

It is important for an IV solution to have salts in it so the water and solute can be equal to create an isotonic environment. If there wasn’t, there would either be a hypotonic causing the cell to burst, or there would be hypertonic causing the cell to shrink. We created models of living cells by using dialysis tubing. The dialysis tube represented the cell membrane to act as selectively permeable to water and some solutes. We observed different solutes (NaCl, Ovalbumin, Glucose, Sucrose, and Water) in the dialysis tubing. The problem was what environment the solutes would create and whether water would diffuse in or out of the cell. I predicted that all of the tubes will be in a hypotonic environment after the 30 minutes because there is a higher concentration of water outside the cell. The water will diffuse inside the cell, therefore the cell will gain weight. We took the initial weight of each tube with the solute inside, the final weight, and then after took the percent change in weight. The control of the experiment was the model cell where there was water inside and outside the cell. My data proved my hypothesis and led me to conclude

I observed the different parts of passive transport: diffusion and osmosis, and recognized how they both go with the concentration gradient from an area of high to low concentration. My hypothesis for procedure 1, that all of the dialysis tubings would be in a hypotonic environment was correct. This occurred because the tubings were placed in a beaker of water, meaning that there was a higher concentration of water than the solute, causing the water to diffuse in the cell after 30 minutes. When water diffuses into the cell, this causes the cell to be enlarged. Some possible errors that could have made in the experiments would be failure to pay attention to the timing when the tubes and potatoes were in the solutions, inaccurate measuring when gathering the solutions, and differences in the size of the potatoes which may have had an effect on the results. This experiment relates to the AP Biology Big ideas and Science Practices because by observing the cells, I tried to maintain equilibrium or homeostasis by being in an isotonic environment, while also using representations and models to communicate scientific theories when using the dialysis tubings to form as cells. I properly calculated mathematics by using the percent change formula, and I feel I gained more knowledge by questioning and forming my beginning hypothesis for each