The Measurement of Acid Dissociation Constants and Ion-pair Dissociation Constants in Solvents of Intermediate Dielectric Constant. Carboxylic Acids and their Sodium and Potassium Salts in 70% Dioxane-30% Water1

1957 ◽  
Vol 79 (6) ◽  
pp. 1372-1376
Author(s):  
E. Lee Purlee ◽  
Ernest Grunwald
Keyword(s):  
Dielectric Constant ◽  
Carboxylic Acids ◽  
Dissociation Constants ◽  
Ion Pair ◽  
Acid Dissociation ◽  
Potassium Salts ◽  
Acid Dissociation Constants ◽  
Sodium And Potassium

Decomposition of some cyclic dithiocarbamates

1970 ◽  
Vol 48 (14) ◽  
pp. 2204-2209 ◽  
Author(s):  
Ronald R. Vandebeek ◽  
Serge J. Joris ◽  
Keijo I. Aspila ◽  
Chuni L. Chakrabarti
Keyword(s):  
Dielectric Constant ◽  
Dissociation Constants ◽  
Acid Dissociation ◽  
Acid Molecule ◽  
Decomposition Rates ◽  
Acid Dissociation Constants ◽  
Ring Strain ◽  
Relative Stabilities ◽  
Ph Values ◽  
The Stability

The stability of some cyclic N,N-disubstituted dithiocarbamates has been studied by the analysis of the decomposition rates at different pH values. It is concluded that the most important factors which determine the relative stabilities of three cyclic dithiocarbamates (DTC) are the solvation of the DTC acid molecule and the ring strain associated with the substituents. This has been proven by a study of (a) the decomposition rates as a function of the dielectric constant of the medium, (b) order of the stability, and (c) activation energy.The molar absorptivities and the apparent acid dissociation constants have been determined for pyrrolidine-, piperidine-, and hexamethylene-dithiocarbamates.

The dependence of acid dissociation constants in water on temperature as expressed by the Gurney equation

1981 ◽  
Vol 59 (19) ◽  
pp. 2845-2847 ◽  
Author(s):  
Michael J. Blandamer ◽  
John Burgess ◽  
Philip P. Duce ◽  
Ross E. Robertson ◽  
John W. M. Scott
Keyword(s):  
Carboxylic Acids ◽  
Newton Method ◽  
Dissociation Constants ◽  
Acid Dissociation ◽  
Acid Dissociation Constants

The dependence on temperature of the acid dissociation constants in water for a range of carboxylic acids has been fitted to the Gurney equation using a modified Gauss–Newton method. The equation fits the data reasonably well and identifies the dependence on temperature of the electrical and non-electrical contributions to ln K.

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