1- If we change the content of those bags with similar concentrations of salt ra
ID: 209624 • Letter: 1
Question
1-
If we change the content of those bags with similar concentrations of salt rather than sugar, do you think the results will be significantly different? Give reason.
2- (Not related to previous table) What physical property of the dialysis tubing might explain its differential permeability ? ( Letting both sulfate and cholride ions to pass while starch and albumin not)
Bag Bag contents Beaker Content Bag weight (g)after 0 min. Bag weight(g) after 60 min Weight change(g) 1 H2O H2O 10.361 10.257 0.104 2 15% Sucrose H2O 14.785 15.285 0.5 3 30% Sucrose H2O 13.526 16.423 2.897 4 H2O 30 %Sucrose 10.514 8.164 -2.35Explanation / Answer
1. Ans:
Yes. Because the sucrose is monovalent. It does not make to much osmosis. Since osmosis is colligative property it depends on species number. Since salts have multiple valency ( Ex: NaCl - Na and Cl two species) it icreases osmosis and increase the volume more.
2. Ans:
The membrane pore size (Cutoff size)of the dialysis tubing mainly results in differential permeability. For example 10 Kd cutoff will easily permeable to ions not big structures like albumin or starch.
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