et on anaerobic processes. We will meet examples in more detail whon looking at
ID: 253942 • Letter: E
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et on anaerobic processes. We will meet examples in more detail whon looking at animale from marine frechwater and semiterres 10. You have a mole of two different compounds, "A" & "B" which CANNOT penetrate a cell membrane (non-penetrating). You dissolve both in separate beakers containing 1 liter of water. You then place identical "shell-less" egg (which do not contain any A or B molecules and whose membranes only allow water movement) into each solution and follow the weight change. You notice that the egg in solution A gains weight, while the egg in solution B loses weight -yet you placed ONE MOLE of each solute into solution!! Please briefly explain how this could happen Chint: molarity vs. osmolarity). (4 pts)Explanation / Answer
Let's understand this with an example,
NaCl ------> Na+ + Cl-
Na3PO4 -----> 3 Na+ + PO4-3
Solution A = 1 M NaCl solution = 2 Osm
Solution B = 1 M Na3PO4 solution = 4 Osm
It is given that egg in solution A gains weight. So, water must enter from solution A into the eggshell. This is possible only when the osmolarity of the egg solution is greater than solution A.
On the other hand, that egg in solution B loses weight. So, water must move from eggshell into solution B. This is possible only when the osmolarity of the egg solution is lesser than solution B.
Assume that the osmolarity of the egg solution = 3 osm
Now, we can see that water moves from 1M NaCl solution into eggshell whereas water moves out of the eggshell solution into solution B.
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