#2. Nelson 7.3 which is the following: You are trying to make artificial blood c
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Question
#2. Nelson 7.3 which is the following: You are trying to make artificial blood cells. You have managed to get pure lipid bilayers to form spherical bags of radius 10um, filled with hemoglobin. The first time you did this, you transferred the "cells" into pure water and they promptly burst, spilling the contents. Eventually you found that transferring them to a 1 mM salt solution prevents bursting, leaving the "cells" spherical and full of hemoglobin and water when you try this? solution electrically conducting. How many moles per liter of glucose should you a. If 1 mM is good, then would 2 mM be twice as good? What happens b. Later you decide that you don't want salt outside because it makes younr use instead?Explanation / Answer
Answer:
2. (a) No, 2 mM wouldn't be twice as good. We want the cells to be in equilibrium with the environment, meaning that the osmotic pressure would be the same on both sides of the cells. If the environment were 2 mM, water would seep out of the cell until it reduced to half its original volume.
(b) What matters for osmotic pressure is the number density, not the nature of the solute. However, salt at 1 mM has twice the concentration of solute as sugar at 1 mM because salt dissociates into two ions, so we want 2 mM sugar.
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