Read the introduction to the lab and the information below. For your first osmos

Question

Read the introduction to the lab and the information below. For your first osmosis experiment, you will be using dialysis tubing to mimic a cell membrane. The tubing consists of cellulose modified to create uniformly sized pores. These pores act as selective filters, blocking the passage of some solutes while allowing smaller solutes through. In your lab group, you will investigate the permeability of the dialysis tubing using glucose (C_6H_12O_6), starch (glucose polymer), and potassium iodide (l_2KI). You will put both glucose and starch within the dialysis bag, and place the dialysis bag into a water solution containing l_2KI. After waiting 30 minutes, you will evaluate the permeability of the dialysis bag using two tests: I_2KI test: I_2KI will test for the presence of starch. In the presence of starch, the solution will turn purple to black. In the absence of starch, an l_2KI solution will remain yellow to amber Benedict's Test: Benedict's reagent is a copper containing reagent, which precipitates as a red copper oxide when reduced. When heated in the presence of a reducing sugar, the solution will change color from blue to green or orange, depending on how much sugar is present. In the absence of sugar Benedict's reagent will remain blue.

Explanation / Answer

Question: Does dialysis tube permits the movement of solute particles from one region to the other?

Hypothesis: There is a movement of solute particles from the region of higher concentration to a region of lower concentration across a selectively permeable membrane.

Prediction: Glucose molecules will move across the dialysis tube but, the starch molecules will not cross the membrane.

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