Differential permeability of membranes

Differential permeability of membranes - Joshua Sipe...

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Joshua Sipe Biology104 SectionM01 March 4, 2008 Title : Differential Permeability of Membranes Abstract: The objective of this lab is to examine how a membrane limits diffusion depending on the size of the molecule, molecular weight and the membranes selective permeability. Dialysis tubing filled with starch sulfate was placed inside a beaker containing a protein chloride solution for an hour. Once diffusion of the membrane occurred both the dialysis tubing and the beaker full of solution were tested against different indicators. The indicators used in the lab were iodine for starch, 2% barium chloride for sodium ions, silver nitrate for chloride ions and copper sulfate and KOH for protein. If indicators changed diffusion took place. Each solution contained different chemicals that react with certain indicators so that only certain particles of each solution could pass through the membrane. In conclusion only the chloride molecule was able to diffuse through the dialysis tubing. Hypothesis
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Differential permeability of membranes - Joshua Sipe...

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