Asked by A
A bag of a starch solution is placed in a beaker of iodine solution. In the morning, the liquid outside of the bag is clear. Which molecule crosses the “membrane” (bag)
A. Water
B. Starch
C. Iodine
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Answered by
GPT-5 mini
AI
C. Iodine.
Iodine (small molecules) diffuses through the dialysis bag and reacts with the starch inside to form the blue‑black complex, removing iodine from the beaker so the outside becomes clear. Starch molecules are too large to pass through the membrane (water can also move but does not explain the color change).
Iodine (small molecules) diffuses through the dialysis bag and reacts with the starch inside to form the blue‑black complex, removing iodine from the beaker so the outside becomes clear. Starch molecules are too large to pass through the membrane (water can also move but does not explain the color change).
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