Diffusion through the Membranes

1. Diffusion through the Membranes Sita Damaraju (Fellow) Professional Day at NJIT 16 February, 2011

2. Applications • Biology of all Levels • Chemistry

3. Diffusion • A process that allows ions or molecules to move from a region higher concentration to a region of lower concentration until equilibrium is attained.

4. Vernier Experiment • A conductivity probe will be used to monitor ions in solution and monitor its concentration over a period of time. • AIM: Study the effect of concentration gradients on the rate of diffusion. Determine if the diffusion rate for a molecule is affected by the presence of a second molecule.

5. Materials • Computer • Vernier conductivity probe • Logger pro software • Graduated cylinders-3 • 1%, 5% and 10% salt solutions • 400 mL beaker • Dialysis tubing • 5% sucrose solution • Dental floss or clamp • Ring stand and utility clamp

6. DATA Part I: When dialysis consisting of salt solution is placed in clean water. (Concentration gradients) Part II: When dialysis tubing consisting of salt solution is placed in sucrose solution. (Effect of other molecules)

7. Part I: Data Part II Data

8. Data Summary

9. Solutions

10. Part I: Data Part II Data

11. Data Summary