Are Molecules Exchanged Between a Solid and Liquid in Equlibrium?
No, molecules do not exchange between a solid and liquid in equilibrium. This is because the concentrations of particles are always the same no matter how many times they are exchanged. In other words, two fluids will remain at equilibrium until one makes more or less than the other.
In equilibrium, both substances would have equal concentrations of each molecule. This does not occur when substances are mixed because reactions will happen to create new molecules. In other words, if you put sugar into water and stir it around, the sugar will eventually dissolve into the water due to reaction. The water won’t become saturated as long as there’s more sugar that can dissolves down.