In a lab experiment on Dialysis, to check if starch moves through the differe...

Question:

In a lab experiment on Dialysis, to check if starch moves through the differentially permeable membrane of dialysis tubing.

You started by placing a dialysis tube filled with starch solution into a beaker filled with distilled water and a few drops of iodine. You concluded that starch does not move through the dialysis tubing.

Describe the solution in the dialysis tube as hypotonic, hypertonic or isotonic with respect to the the distilled water in the beaker.

Diffusion and Osmosis

Diffusion is the process where substances pass from a lower concentration to a higher concentration. Osmosis is the diffusion of water that passes through a semipermeable membrane from an area of higher concentration to a lower concentration.

Answer and Explanation:

Starch reacts in the presence of iodine to produce a purple-brown color. In the lab experiment on Dialysis and checking if starch moves through the differentially permeable membrane of the dialysis tubing, if the starch had passed through, there would have been a reaction to the drops of iodine and a color change to purple-brown indicating the presence of starch. The solution in the dialysis tube is hypertonic. This means that the starch solution has a higher solute concentration and less water than the iodine solution in the beaker. Therefore, starch would not pass through the membrane of the tubing.