Determination of the activity of water in highly concentrated perchloric acid solutions

1969 ◽  
Vol 47 (12) ◽  
pp. 2326-2328 ◽  
Author(s):  
Henry Wai ◽  
Keith Yates
Keyword(s):  
Perchloric Acid ◽  
Isopiestic Method ◽  
Acid Solutions

The water activities of concentrated aqueous perchloric acids in the range 40–75% have been determined at 25 °C using a modified isopiestic method.

The ketonization of acetophenone enol in concentrated aqueous sulphuric and perchloric acid solutions. Implication on X acidity function correlations of the enolization reaction and determination of the keto–enol equilibrium constant as a function of acidity

1990 ◽  
Vol 68 (10) ◽  
pp. 1653-1656 ◽  
Author(s):  
Y. Chiang ◽  
A. J. Kresge ◽  
R. A. More O'ferrall ◽  
B. A. Murray ◽  
N. P. Schepp ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Key Words ◽  
Equilibrium Constant ◽  
Perchloric Acid ◽  
Acidity Function ◽  
Acid Solutions ◽  
Function Correlation ◽  
Aqueous Perchloric Acid ◽  
Sulfuric Acid Solutions

Rates of ketonization of the enol of acetophenone, generated by flash photolytic photohydration of phenylacetylene, were measured in aqueous sulfuric and perchloric acid solutions over the concentration range 1–50 wt.% acid; rates of enolization of acetophenone, monitored by bromine scavenging, were also measured in aqueous perchloric acid solutions over the same concentration range. The results suggest that the curvature observed in a previous X acidity function correlation of the rate of enolization in sulfuric acid solutions was an artifact produced by insufficiently efficient scavenging, and that introduction of the activity of water in the correlating expression, used previously to eliminate the curvature and believed to reflect covalent involvement of water in the enolization reaction, is unnecessary. The present results also show that the keto–enol equilibrium constant for acetophenone decreases with increasing acidity in these concentrated sulfuric and perchloric acid solutions. Key words: acetophenone, enolization, ketonization, keto–enol equilibrium, concentrated acid solutions.

Deproteinizing methods evaluated for determination of uric acid in serum by reversed-phase liquid chromatography with ultraviolet detection.

1987 ◽  
Vol 33 (8) ◽  
pp. 1427-1430 ◽  
Author(s):  
R Sakuma ◽  
T Nishina ◽  
M Kitamura
Keyword(s):  
Uric Acid ◽  
Liquid Chromatography ◽  
Perchloric Acid ◽  
High Performance ◽  
Reversed Phase ◽  
Precipitation Method ◽  
Zinc Hydroxide ◽  
Good Precision ◽  
Ultraviolet Detection

Abstract We evaluated six deproteinizing methods for determination of uric acid in serum by "high-performance" liquid chromatography with ultraviolet detection: those involving zinc hydroxide, sodium tungstate, trichloroacetic acid, perchloric acid, acetonitrile, and centrifugal ultrafiltration (with Amicon MPS-1 devices). We used a Toyosoda ODS-120A reversed-phase column. The mobile phase was sodium phosphate buffer (40 mmol/L, pH 2.2) containing 20 mL of methanol per liter. Absorbance of the eluate was monitored at 284 nm. The precipitation method with perchloric acid gave high recoveries of uric acid and good precision, and results agreed with those by the uricase-catalase method of Kageyama (Clin Chim Acta 1971;31:421-6).

The Solubility Of UO2HPO4.4H2O in Perchloric Acid Solutions

1955 ◽  
Vol 59 (11) ◽  
pp. 1179-1181 ◽  
Author(s):  
James M. Schreyer ◽  
C. F. Baes
Keyword(s):  
Perchloric Acid ◽  
Acid Solutions

Electrochemical behaviour of galena (PbS) in aqueous nitric acid and perchloric acid solutions

2004 ◽  
Vol 34 (1) ◽  
pp. 37-46 ◽  
Author(s):  
Yu. Mikhlin ◽  
A. Kuklinskiy ◽  
E. Mikhlina ◽  
V. Kargin ◽  
I. Asanov
Keyword(s):  
Nitric Acid ◽  
Perchloric Acid ◽  
Electrochemical Behaviour ◽  
Acid Solutions ◽  
Aqueous Nitric Acid
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