Question

If the dialysis sac is permeable only to water and iodine, what will the solutions in the beaker and the sac look like after two hours?

A The iodine solution in the beaker will turn blue-black; the starch solution will not change.
B The starch solution in the dialysis sac will turn blue-black; the iodine solution will not change.
C Neither solution will turn blue-black.
D Both solutions will turn blue-black.

Answer 1

Starch turns blue-black in the presence of iodine solution. A selectively permeable dialysis sac containing a starch solution is placed into a beaker of iodine solution.

If the dialysis sac is permeable only to water and iodine, what will the solutions in the beaker and the sac look like after two hours?

A The iodine solution in the beaker will turn blue-black; the starch solution will not change.
B The starch solution in the dialysis sac will turn blue-black; the iodine solution will not change.
C Neither solution will turn blue-black.
D Both solutions will turn blue-black.

Answer 2

The starch solution in the dialysis sac will turn blue-black; the iodine solution will not change

Answer 3

The starch solution in the dialysis sac will turn blue-black; the iodine solution will not change.

Answer 4

http://mdk12.org/instruction/clg/public_release/biology/G3_E1_I2.html