Before you read this, I suggest you read posts 16.37, 18.25 and 18.27. In post 18.27 we saw that molecules in a solution are free to move around like molecules in a gas. There are two main differences. The first is that, in a gas, movement of the molecules is constrained only by the walls… Continue reading 18.28 Applying the ideal gas equation to solutions

Before you read this, I suggest you read post 18.26. Molecules in solution can diffuse through the pores in a membrane, if the pores are big enough. The membrane is coloured green in the picture above. On the left-hand side of the picture , bigger molecules (red) are dissolved in water molecules (blue); on the… Continue reading 18.27 Diffusion through membranes, osmosis and dialysis