|
|
| Home > JCE Print > Journal of Chemical Education > Issues >
2001
>
January
> |
|
Research: Science and Education
|
|
|
|
The Solubility Rules: Why Are All Acetates Soluble?
|
William G. Van Der Sluys
Department of Biology, Chemistry and Health Sciences, Wilkes University, Wilkes-Barre, PA 18766
|
|
January 2001
Vol. 78 No. 1
p. 111
|
|
|
|
|
|
|
| Abstract |
|
According to the solubility rules presented in many introductory chemistry texts, all (or most) acetate salts are soluble in aqueous solution. The thermodynamic factors that contribute to the solubility of acetates are compared with those of other slightly basic anions. In particular, the hydration enthalpy of acetate is calculated using the Born-Haber approach, from lattice energies, heats of solution, and the hydration energies of several cations. The hydration enthalpy of acetate (-375 kJ/mol) is similar to that of chloride ({355 kJ/mol), nitrite ({383 kJ/mol), and nitrate ({370 kJ/mol), which are all considerably less exothermic than fluoride ({497 kJ/mol). This was somewhat unexpected, since hydration enthalpies generally correlate well with the acid-base properties of an ion, and acetate is more basic than fluoride. Factors influencing the solubility and acid-base properties of acetates, such as the electron donating and hydrophobic nature of the methyl group, are discussed in light of the thermodynamic data.
|
|
| More Information |
 Citation |
Van Der Sluys, William G. J. Chem. Educ. 2001 78 111.
|
Keywords |
Aqueous Solution Chemistry; Inorganic Chemistry; Textbooks; Thermodynamics; Water / Water Chemistry
|
History |
Created:
Last Updated: |
November 30, 2000
August 31, 2005
|
|
|
|
|
|
| Home > JCE Print > Journal of Chemical Education > Issues >
2001
>
January
> Page
111
|
|
|
| JCE HS CLIC |
|
Our Secondary School editors work hard to distill all the JCE materials to produce a fraction of particular interest to high school teachers. We call it CLIC.
|
| Contributions Welcome |
| JCE welcomes your submission |
| Advertisers |
| In recent years we have worked hard to better match our advertisers with our readers. When shopping for chemistry education materials, visit our advertisers' WWW sites first. |
| Be An Ambassador |
| Take JCE along on your outreach missions. Copies of the Journal, guest access to JCE Online, our publications catalog, and more are available for your participants. |
|
