6. Iodine crystals dissolve in hexane more readily than in water. However, if th

Question

6. Iodine crystals dissolve in hexane more readily than in water. However, if the iodine crystals are left in the water for an extended time period, they will dissolve at the interface. This can best be explained because (A) iodine, although nonpolar in nature, has permanent dipoles that can interact with the polar water molecules. (B) iodine, although nonpolar in nature, has momentary dipoles that can then interact with the polar water molecules. (C) iodine, although nonpolar in nature, has a large molar mass, which allows it to interact with the polar water molecules (D) iodine, although nonpolar in nature, has a relatively low melting point, which allows it to interact with the polar water molecules.

Explanation / Answer

6. Iodine is a non-polar molecule

Thus it does not dissolve in water readily

However, when left in water iodine crystals dissolves at the interface, this is due to the fact that,

(B) iodine although nonpolar in nature, has momentary dipoles that can then interact with the polar water molecules

In presence of water (polar), iodine develops induced dipole which then interacts with water and thus iodine dissolves at the interface and give coloration.

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