Diffusion and Osmosis Experiment 2: Diffusion - Concentration Gradients and Membrane Permeability

Data Tables and Post-Lab Questions

Table 3: Indicator Reagent Data

Post-Lab Questions

1. Why is it necessary to have positive and negative controls in this experiment?   

2. Draw a diagram of the experimental set­up. Use arrows to depict the movement of each substance in the dialysis bag and the beaker.  

3. Which substance(s) crossed the dialysis membrane? Support your response with data-based evidence

4. Which molecules remained inside of the dialysis bag? 

5. Did all of the molecules diffuse out of the bag into the beaker? Why or why not?