We must talk about the amount of solid molecules per some given volume. And in fact, that's concentration. So our concentration on the outside, because we have more molecules, is higher than the concentration on the inside. So what will happen? Well, entropy tells us that in this case, the only thing that can move, which is a solvent and the water will move and water will travel from the inside to the outside. So our cell will shrink in size and our concentration will increase in size because now we have less volume.