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Thermodynamics of the H+Na+ and H+Cs+ exchange on tin(IV) antimonate in methanolic solution

✍ Scribed by I.M. El-Naggar; E.S. Zakaria; H.F. Aly

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 502 KB
Volume: 28
Category: Article
ISSN: 1381-5148
DOI: 10.1016/1381-5148(95)00098-4

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✦ Synopsis

Addition of methanol decreases AG", AH' and As0 of the exchange of Naf or Cs+ for H+ in tin(W) antimonate. Thus, the increase of selectivity constant is due to the decrease in the enthalpy term. On going from 30 to 90% (w/w) methanol, negative enthalpy and entropy changes occur may be due to chemisorption of methanol.

In the 30 and 60% (w/w) methanol solutions, both AH" and As0 are lower than in aqueous medium. Thus, the decrease of AGo on addition of methanol is due to the enthalpy term. The Na+/H+ exchange reaction is entropy directed while the Cs+/H+ exchange is enthalpy directed.

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