HydroCarbon
Hazard to Self
Posts: 77
Registered: 7-7-2008
Location: Anytown, USA
Member Is Offline
Mood: No Mood
|
|
Non-polar solvation
The simplistic mechanism for polar solvation is quite basic and easy to understand. The oppositely charged zones of the solvent and solute provide a
means for the solvent to pull apart the solute and distribute it evenly throughout the medium.
A simplistic mechanism for non-polar solvation, however, puzzles me. I can't think of any reason why the individual units of solute would have a
reason to be pulled into homogeneous solution by the solvent. Does true non-polar solvation even exist? Or does a slight polarity of so called
non-polar molecules account for it's occurrence?
I tried searching Google for answers but came up with nada. I was hoping some of the bright folks here could help me out.
|
|
|
vulture
Forum Gatekeeper
Posts: 3330
Registered: 25-5-2002
Location: France
Member Is Offline
Mood: No Mood
|
|
Entropy increase mostly, molecules in solution have vastly increased degrees of freedom.
One shouldn't accept or resort to the mutilation of science to appease the mentally impaired.
|
|
|
watson.fawkes
International Hazard
Posts: 2793
Registered: 16-8-2008
Member Is Offline
Mood: No Mood
|
|
| Quote: | Originally posted by HydroCarbon
A simplistic mechanism for non-polar solvation, however, puzzles me. I can't think of any reason why the individual units of solute would have a
reason to be pulled into homogeneous solution by the solvent. |
The Wikipedia page on Solvation has a perfectly adequate explanation, but you've got to know some thermodynamics to make sense of it. The basic idea is that when
attraction between solute and solution molecules is greater than solute and solute molecules, you get solvation. From that page: "The hydrogen
bonding, ion-dipole, and dipole-dipole interactions occur only in polar solvents." These are three of the energy modes that cause the attraction to be
different.
|
|
|
kmno4
International Hazard
Posts: 1502
Registered: 1-6-2005
Location: Silly, stupid country
Member Is Offline
Mood: No Mood
|
|
There is an excellent ebook:
Solvents and Solvent Effects in Organic Chemistry
http://www3.interscience.wiley.com/cgi-bin/bookhome/10762866...
Very interesting aspects of solvents and solvations, amazing acidities in gas phase and many other things.
Availble from anywhere (gigapedia etc.....)
[Edited on 22-3-2009 by kmno4]
Слава Україні !
Героям слава !
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
