AP BIOLOGY

Detailed explanation-1: -Place the dialysis bag into the beaker of water as shown in Figure 1. 7. Allow the beaker to sit undisturbed for 10–15 minutes.

Detailed explanation-2: -The bag filled with the distilled water will decrease in mass as will the dialysis bag with 0.2M of sucrose. The decrease in mass is due to the concentration of the solutes being higher in the solution outside of the dialysis bag, which will cause water to flow out.

Detailed explanation-3: -The environment around it, in the beaker, is a salt solution. The environment is therefore hypertonic, which means that it has a higher concentration of solutes than the interior of the tube. Water will move OUT of the dialysis tube in order to concentrate the substances inside the tube.

Detailed explanation-4: -Dialysis is possible because of the unequal rates of diffusion through a semipermeable membrane. A semipermeable membrane is a membrane that lets some molecules to pass through it while not letting others (Figure 1).