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General Chemistry Principles, Patterns, and Applications, 2011

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Low-molecular-mass hydrocarbons with highly electronegative <strong>and</strong><br />

polarizable halogen atoms, such as chloroform (CHCl3) <strong>and</strong> methylene chloride (CH2Cl2), have both significant dipole<br />

moments <strong>and</strong> relatively strong London dispersion forces. These hydrocarbons are therefore powerful solvents for a<br />

wide range of polar <strong>and</strong> nonpolar compounds. Naphthalene, which is nonpolar, <strong>and</strong> phenol (C6H5OH), which is polar,<br />

are very soluble in chloroform. In contrast, the solubility of ionic compounds is largely determined not by the polarity<br />

of the solvent but rather by its dielectric constant, a measure of its ability to separate ions in solution, as you will soon<br />

see.<br />

E X A M P L E 2<br />

Identify the most important solute–solvent interactions in each solution.<br />

a. iodine in benzene<br />

b. aniline (C 6H 5NH 2) in dichloromethane (CH 2Cl 2)<br />

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

Saylor.org<br />

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