Isopiestic measurements of the osmotic and activity coefficients for the system perchloric acid-barium perchlorate-water at 25.degree.C

1986 ◽  
Vol 31 (4) ◽  
pp. 478-481 ◽  
Author(s):  
Richard M. Rush
Keyword(s):  
Activity Coefficients ◽  
Perchloric Acid ◽  
Isopiestic Measurements ◽  
Barium Perchlorate

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

The Osmotic and Activity Coefficients of Calcium, Strontium and Barium Perchlorate at 25°

1953 ◽  
Vol 75 (20) ◽  
pp. 5130-5130 ◽  
Author(s):  
R. A. Robinson ◽  
C. K. Lim ◽  
K. P. Ang
Keyword(s):  
Activity Coefficients ◽  
Barium Perchlorate

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.

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