[randlet]

> If the second glass of water has no salt in it, then salt will start crossing the membrane and equalising the salt levels in both glasses.

Is that correct? Normally in osmosis water will cross the membrane to equalize concentration of ions right?

[jonsen]

Generally it depends on if and how fast molecules of water and solvents are able to pass through the membrane.

Say sodium and water passes equally well, there will be a net flow of water one way, and a net flow of sodium the other way. Notice that the flow of water will make the water rise on the flow-to side, then pressure there will rise and oppose the flow.

[d1sxeyes]

You are right, I used the wrong word, I should have said diffusion.