Medium dependence of acidity functions and activity coefficients in perchloric acid

1973 ◽  
Vol 95 (2) ◽  
pp. 418-426 ◽  
Author(s):  
Keith. Yates ◽  
Henry. Wai ◽  
Graeme. Welch ◽  
Robert A. McClelland
Keyword(s):  
Activity Coefficients ◽  
Perchloric Acid ◽  
Acidity Functions

Acidity functions of hydrochloric acid, perchloric acid, and sulfuric acid and pKa values of some primary aromatic amines in 50% volume/volume aqueous ethanol

1977 ◽  
Vol 42 (1) ◽  
pp. 162-165 ◽  
Author(s):  
William N. White ◽  
Thomas Vogelmann ◽  
Michael Morse ◽  
Hilda S. White
Keyword(s):  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Perchloric Acid ◽  
Aromatic Amines ◽  
Aqueous Ethanol ◽  
Pka Values ◽  
Primary Aromatic Amines ◽  
Acidity Functions

The hydrolysis of thioacetic, thiobenzoic, and three substituted thiobenzoic acids in perchloric and sulfuric acids

1978 ◽  
Vol 56 (7) ◽  
pp. 935-940 ◽  
Author(s):  
John T. Edward ◽  
Graeme Welch ◽  
Sin Cheong Wong
Keyword(s):  
Sulfuric Acid ◽  
Activity Coefficients ◽  
Acid Concentration ◽  
Perchloric Acid ◽  
Transition States ◽  
Sulfuric Acid Concentration ◽  
Thiobenzoic Acid ◽  
The Difference ◽  
Different Response ◽  
Hydrolysis Of

The rates of hydrolysis of thioacetic, thiobenzoic, and three substituted thiobenzoic acids increase with concentration of solvent sulfuric or perchloric acid to a maximum in 30–40% acid and then decrease. Yates–McClelland r, Bunnett–Olsen [Formula: see text], and Hammett ρ parameters, and entropies of activation indicate an AAC2 mechanism over this range of acid concentrations. In acid concentrations above 50–60% the rates increase sharply and the same mechanistic criteria now indicate an AAc1 mechanism. The difference between the rate–acidity profile of thiobenzoic acid and that of ethyl thiolbenzoate can be explained by the different response of the activity coefficients of their transition states to increase in sulfuric acid concentration.

THE ACIDITY FUNCTIONS H0 AND J0(HR) FOR THE SYSTEM FORMIC ACID–WATER

1960 ◽  
Vol 38 (4) ◽  
pp. 602-611 ◽  
Author(s):  
Ross Stewart ◽  
Trevor Mathews
Keyword(s):  
Formic Acid ◽  
Activity Coefficients ◽  
Water System ◽  
Acid Water ◽  
Concentrated Solutions ◽  
Acidity Functions

The acidity functions H0 and J0(HR) have been measured for the whole range of the formic acid – water system. The large negative J0 values for the more concentrated solutions fail to correlate with the functions derived by Gold on the basis of certain assumptions regarding the activity coefficients of the species involved. The cause of this deviation is discussed. The term log [R+]/[ROH] for the ionization of triphenylcarbinols in formic acid has been found to vary linearly with 1/T.

Sign in / Sign up

Export Citation Format

Share Document