Diffusion through a membrane part 2 diffusion of water across a membrane osmosis osmosis is a special type of diffusion specifically it is the diffusion of water across a membrane osmosis is a very important process because it enables cells to maintain the proper water balance generally water will diffuse across a. Diffusion through a membrane e a laboratory activity for the living environment part i diffusion through a membrane molecules are constantly moving they move in straight lines unless they are deflected by other molecules or obstacles in their environment diffusion is the process by which the collisions between. Diffusion through a membrane indicator chemically indicates if a substance is present by changing color iodine starch indicator solution benedicts solution glucose indicator solution must be heated. Iodine turns blue in reaction to starch when a starch solution is placed in dialysis tubing a semi permeable membrane and the tubing is added to a beaker . Diffusion through a cell membrane introduction substances such as water ions and molecules needed for cellular processes can enter and leave cells by a passive process such as diffusion diffusion is random movement of molecules but has a net direction toward regions of lower concentration in order to reach an equillibrium
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