Lab #2 - 6 See attached graph 7 The weight change is the...

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Sylwester Czado 9-27-07 BIO 244, Lab #2 TA: Shannon Gerry Diffusion and Osmosis Worksheet 1. Diffusion is the movement of molecules from high to low concentration. Osmosis is the movement of H 2 O from high to low concentration, or low solute to high solute. 2. MWCO is the largest size of molecules that will fit through the pores in the membrane. For example, if the MWCO is 500 and a molecule weighs 800 g/mol, then it will not diffuse through the membrane. 3. Neither will diffuse out of the bag with a MWCO of 10. Also, neither of the two will diffuse out of the bag with a MWCO of 100. However, both glucose and starch will diffuse out of the bag with a MWCO of 1,000,000. 4. Glucose diffused through the dialysis tubing because its molecular weight is 180 g/mol, which is lower than the MWCO of 3,500. 5. Starch remained in the dialysis tubing because it is made up of long chains of sugars. Therefore, its molecular weight was much more than the MWCO of 3,500 so it did not diffuse.
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Unformatted text preview: 6. See attached graph 7. The weight change is the result of starch not diffusing through the dialysis tube. Also, the weight increased because of the process of osmosis. As time increased so did the weight. This shows a direct relationship between the time and weight. 8. In order to do this, you would put the Na+ ions and K+ ions in a dialysis tube that has a certain MWCO to allow the Na+ ions out, but not the K+ ions. Then the tube would only have K+ ions inside. The Na+ ions would be outside of the solution. This would allow you to transfer the Na+ ions into a new solution. 9. An example of the process of dialysis used in practice for people is Kidney Dialysis. It acts as an artificial kidney where blood is circulated outside the body and cleaned inside a dialysis machine before returning to the patient. This removes wastes and extra fluid from blood. This process is used in place of kidneys lost to disease, birth defects, or injury....
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This note was uploaded on 04/30/2008 for the course BIO 244 taught by Professor Van sciver during the Fall '06 term at Rhode Island.

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Lab #2 - 6 See attached graph 7 The weight change is the...

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