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General Chemistry Principles, Patterns, and Applications, 2011

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iodine in water<br />

Given: components of solutions<br />

Asked for: predominant solute–solvent interactions<br />

Strategy:<br />

Identify all possible intermolecular interactions for both the solute <strong>and</strong> the solvent: London dispersion<br />

forces, dipole–dipole interactions, or hydrogen bonding. Determine which is likely to be the most<br />

important factor in solution formation.<br />

Solution:<br />

a. Benzene <strong>and</strong> I 2 are both nonpolar molecules. The only possible attractive forces are<br />

London dispersion forces.<br />

b. Aniline is a polar molecule with an –NH 2 group, which can act as a hydrogen bond donor.<br />

Dichloromethane is also polar, but it has no obvious hydrogen bond acceptor. Therefore,<br />

the most important interactions between aniline <strong>and</strong> CH 2Cl 2are likely to be London<br />

interactions.<br />

c. Water is a highly polar molecule that engages in extensive hydrogen bonding, whereas<br />

I 2 is a nonpolar molecule that cannot act as a hydrogen bond donor or acceptor. The<br />

slight solubility of I 2 in water (1.3 × 10 −3 mol/L at 25°C) is due to London dispersion forces.<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

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