Diffusion is defined as the spontaneous tendency of a substance to move down its concentration gradient from a more concentrated to a less concentrated area. This means that molecules move from an area of where there is a high concentration of them to where there is a low concentration. Osmosis is said to be the diffusion of water across a selectively permeable membrane. A membrane is said to be selectively permeable because it only allows …showed first 75 words of 539 total…

…showed last 75 words of 539 total…into the tubing. This is an example of how water moves from a hypotonic solution to a hypertonic solution. The tube that had the least change in weight will be the .2 M solution. Because there is not a very steep gradient of solute concentration between the beaker and the tubing there will not be a great gain of water inside the tube. The .6 and .4 molar solutions can now be figured out based on this information.