If there are two solutions separated by a membrane, which is permeable only to one solute and the solvent, will there be any net movement? Let's assume the two solutes are glucose and sodium ions, with the same molarity, and only the glucose and water can pass through the membrane.


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    $\begingroup$ Is the membrane also permeable to the solvent? (water?) $\endgroup$ – Roland Mar 2 '16 at 7:26
  • $\begingroup$ Brownian motion describes there will be some movement. As glucose moves across the membrane, water will follow. I don't understand the nature of this question. Could you clarify? At the moment I think it's more suitable for chemistry. $\endgroup$ – James Mar 2 '16 at 7:29
  • $\begingroup$ Let's say the membrane is also permeable to water. James, I am interested if there will be any osmosis, also will there be any diffusion? $\endgroup$ – Ryan Ward Mar 2 '16 at 13:53
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    $\begingroup$ There will be net movement of glucose from high concentration to low concentration via diffusion, but not Na (as it cannot pass through). $\endgroup$ – another 'Homo sapien' Mar 2 '16 at 14:34
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    $\begingroup$ There will be movement, but no net movement as water will keep moving from one side to another. When the side with Na+ becomes more concentrated, water will move that side which will increase concentration in the side not having Na+ by which water will then move that side. Thus there will be no net movement of water. $\endgroup$ – another 'Homo sapien' Mar 3 '16 at 3:26

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