The selective permeability of membranes is of fundamental importance to cellular physiology. Students will perform experimental procedures involving diffusion, dialysis, water potential and osmotic potential. For 10 lab groups.

Duration: 60 to 90 minutes or two lab periods.

Kit contents:
• Sample A: orange dye
• Sample B: violet dye
• M Sucrose/1 M NaCl solution
• Powdered sucrose
• Dialysis tubing
• Instructions

Required, but not included: beakers, 1, 5 and 10 ml pipets, thermometers, scales, cork borers or small kitchen knives, graph paper, distilled or deionized H₂O, potatoes.