Observe the movement of water and solutes.

• Observe diffusion through a membrane
• Time required: one 50 minutes class period
• Color changes help students visualize osmosis

Can studying the basic life process function of osmosis and diffusion stimulate your students' curiosity? It can with this hands-on lab experience! Students observe first hand the characteristics of a deferentially permeable membrane. Some substances will pass through the membrane and some won't. Some will actually pass through the membrane in both directions simultaneously. Simple color changes help students visualize this biological-physiological phenomenon.