Hello everyone,

Lets say there is a membrane, which has a channel for the solute(eg sodium) and another channel for water

Now if I have a hypertonic (more sodium) solution in side A, and hypotonic (less sodium) solution in side B. Which way would water go?

* I'm very confused here diffusion and osmosis both occuring.

Does water follow sodium or sodium follows water?

Thanks

If the membrane is permeable to all species it might as well not be there and osmosis does not occur.

 

Osmosis occurs when there is a semipermeable membrane that is permeable only to some of the species involved.

Movement will occur in both directions.

The only thing one would need to take into account is the rate of permeability and how much it differs from free diffusion.