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a selectively permeable membrane divides a container in half. one half of the container, side a, is filled with a starch solution, while the other half, side b, is filled with an iodine tincture. starch is a large macromolecule that forms a milky white solution when dissolved. an iodine tincture contains very small iodide ions and is a brown solution. iodide ions turn dark blue when they react with starch molecules. after several hours, side a is dark blue, while side b is brown. which statement describes the diffusion of solutes through the membrane?

Sagot :

The iodide ions flowed across the barrier, but the starch molecules were blocked.

The information provided indicates that starch is a big macromolecule. Substances always diffuse from areas of higher concentration to areas of lower concentration. Iodide ions become dark blue as a result of their reaction with starch. Iodide ions seeped through to the membrane from side B to side A of the container because side A turned dark blue. The side A got dark blue as a result, and the side B would have turned dark blue as well if starch had diffused from side A to side B via the membrane. However, the dark solution was on side B. As a result, the barrier prevented the passage of the big starch molecules.

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