Diffusion across a Selectively Permeable membrane Essay

Introductiondisse minuteation is movement of molecules from unrivalled area of concentration to another. This process is vital for the sprightliness functions of cells. Cells befool selectively semipermeable membranes that allow only certain antecedents to direct finished them. Osmosis is a special kind of diffusion that allows water to go through semi-permeable membranes of high water potential to a region of demoralise water potential. Water potential measures the t completeency of water to put up one place and into another. airing and osmosis is responsible for the movement of molecules in and out of cells. public exposure and osmosis can be shown using dialysis provide which is a membrane that is do of regenerated cellulose fibers into a flat tube. When antecedents that contain dissolved hearts, are separated by a membrane like the dialysis tube-shaped structure, some may readily come up through it and others may not due to the size of the molecules.HypothesisDif fusion and osmosis will buy the farm once dynamic equilibrium is reached. If a substance contains molecules small enough to pass through a selectively permeable membrane then they will readily pass through it without the solution or substance, which is inside the membrane, getting out.MaterialsStringStarch originI2KI SolutionPlastic cupDisposable transfer pipetsStrips of dialysis subway soaked in waterTimerScaleMethodFirst you will have your dialysis tubing soaked in water ready for the essay. Once the dialysis tubing in being soaked, wash your hands to get rid of either oils or dirt that may be on them. Remove the tubing from the water and tie off one end. Open the other end using two fingers in a rubbing motion so that the tubing will separate and open. Use a disposable pipette to fill the tubing with amylum solution. Once the tubing is filled conduce a bit of space so that expansion may occur and tie off the end and place the tubing on the case to see how much it weighs. Fill the cup with distilled water and add I2KI solution to the water. Place the tubing inside the cup for 30 minutes and take down any illusion motley. Record the color change of the stunner each 5 minutes until 30 minutes have passed. Take the tubing out of the water solution and place on the scale and present any weight change.DataSolutionsourceOriginalContentsOriginalcolorOriginalWeight5 mincolor15min color25 mincolor30 min colorFinal weightFinal ContentsBagWater 1% amylumWhite/milky10gWhite slightly fatMilky inside darker blue Darker blue some white visibleDarker blue no white visible11gWater 1% starch + iodine BeakerWater, I2KIAmber yellowN/AAmber YellowAmber YellowAmber YellowAmber YellowN/AWater and iodineResultsThe results show that the water, glucose, and I2KI molecules were small enough to pass through the selectively permeable membrane which was the dialysis tubing. I would expect for the color change to occur in the cup instead of inside of the tubing if we had s tarted with the starch in the cup and the I2KI inside the tubing, because the iodine would instead of going into the bag, would leave through the bag and into the starch inside the cup.Discussion and conclusionThe info shows what molecules can and cannot diffuse across a selectively permeable membrane. The color change that occurred showed that the I2KI molecules were small enough to pass through the pores of the membrane or dialysis tubing. This data also shows that the water and glucose solution moved out of the dialysis bag because water molecules are small enough to pass through the membrane. No mistakes were made in this experiment but many could have occurred. If the tubing was not tied correctly a leak could have occurred and the experiment would have failed and been inaccurate.ReferencesDiffusion and Osmosis. Diffusion. N.p., n.d. Web. 19 Mar. 2014 Diffusion. And Osmosis. N.p., n.d. Web. 20 Mar. 2014.Osmosis. Osmosis. N.p., n.d. Web. 19 Mar. 2014.