Experiment 2: Concentration Gradients and Membrane Permeability In this experiment, you will dialyze a solution of glucose and starch to observe: The directional movement of glucose and starch

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Experiment 2: Concentration Gradients and Membrane Permeability

In this experiment, you will dialyze a solution of glucose and starch to observe:

• The directional movement of glucose and starch.
• The effect of a selectively permeable membrane on the diffusion of these molecules.

An indicator is a substance that changes color when in the presence of a specific substance. In this experiment, IKI will be used as an indicator to test for the presence of starch.

 

Materials (5) 100 mL Beakers 10 mL 1% Glucose Solution, C6H12O6 4 Glucose Test Strips (1) 100 mL Graduated Cylinder 4 mL 1% Iodine-Potassium Iodide, IKI 5 mL Liquid Starch, C6H10O5 3 Pipettes 4 Rubber Bands (Small; contain latex, handle with gloves on if allergic)

Permanent Marker *Stopwatch *Water *Scissors *15.0 cm Dialysis Tubing *You Must Provide *Be sure to measure and cut only the length you need for this experiment. Reserve the remainder for later experiments.