Agar-Cell Diffusion

Materials (ahead of time: to make the agar cubes)

  1. Agar-Agar powder
  2. Scale
  3. Graduated cylinder
  4. Water
  5. Fork
  6. Microwave
  7. Oven mitt
  8. Bromothymol blue
  9. Ammonia
  10. Glass baking pan
  11. Knife

Materials (Day of)

  • Agar cubes
  • Clear container
  • Vinegar
  • Spoon
  • Timers
  • Paper plates

Students immerse agar cubes which have a ph indicator in vinegar. They see how diffusion occurs in objects of different sizes as the acidic vinegar penetrates the agar cube.