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Diffusion and Osmosis Lab ReportLeena BhamrahBackground: Osmosis and diffusion are both specific ways in how molecules are able to move. Diffusion is the random movement of molecules from an area of higher concentration of molecules to a lower concentration of molecules. For example, if someone were to opena bottle of sour milk, the smell would take over the room because of the lower concentration level. It would not be long until someone from the opposite side of the room starts to smell the rotten milk. The high concentration level of the sour milk molecules from the bottle will diffuse over to the rest of the room where there are no sour milk molecules. Eventually, the whole room will be stabilized with the amount of sour milk molecules and will reach equilibrium. Osmosis is a unique and different way of diffusion. Osmosis is the diffusion of water through a selectively permeable membrane (a membrane that allows for diffusion of certain solutes and water) from a region of higher water potential to a region of lower water potential. There are three different types of osmotic solutions; hypotonic, isotonic, and hypertonic. A hypotonic solution has a greater concentration of solute inside cell than outside. Water potential is low (0 in distilled water) and the osmotic potential is higher. There’s net movement of water into the cell from the solution across a semi-permeable membrane. A hypertonic solution has a greater concentration of solute outside of cell than inside. Water potential is higher and the osmotic potential is lower.