ISSN:
1572-8927
Keywords:
Amines
;
neutralizing amines
;
cyclohexylamine
;
morpholine
;
ionization
;
dissociation
;
thermodynamics
;
temperature dependence
;
equilibria, potentiometric
;
elevated temperatures
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract A potentiometric technique using a hydrogen electrode concentration cell with flowing solutions was employed to measure the ionization equilibria of cyclohexylamine and morpholine over the temperature range 50–295°C in dilute KCl media. Also, the isothermal pressure coefficients were determined to 250°C in the same media. Smoothing functions are presented which fit these and other selected data, and thermodynamic quantities for the ionization process were derived. Nearly linear variation of ΔH vsT ΔS was observed for this process as well as other similar reactions, and the significance is discussed. Differences in basicities of amines are found to decrease at elevated temperatures, and reversals in relative base strengths are seen.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00645456
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