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.
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.
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
DATA Table 1 PredictionConclusion Part 1 Part 2 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)
Part I: Data Table 2 Salt Concentration (%)Rate of Diffusion (mg/L/s) 1 5 10 Table 3 SolutionConductivity Water Sugar water Part II Data
Table 4: Summary of Data SolutionRate of diffusion (mg/L/s) 5% Salt 5% Salt/ 5%sugar Data Summary