The Kinetics of the Chromium(VI)-Arsenic(III) Reaction in Acetic Acid-Acetate Buffer Solutions

1964 ◽  
Vol 3 (9) ◽  
pp. 1248-1251 ◽  
Author(s):  
John G. Mason ◽  
Albert D. Kowalak
Keyword(s):  
Acetic Acid ◽  
Acetate Buffer ◽  
Buffer Solutions ◽  
Chromium Vi ◽  
Kinetics Of ◽  
Acetic Acid Acetate

Disproportionation Kinetics of Hypoiodous Acid As Catalyzed and Suppressed by Acetic Acid−Acetate Buffer

1997 ◽  
Vol 36 (7) ◽  
pp. 1338-1344 ◽  
Author(s):  
Edward T. Urbansky ◽  
Brian T. Cooper ◽  
Dale W. Margerum
Keyword(s):  
Acetic Acid ◽  
Acetate Buffer ◽  
Kinetics Of ◽  
Acetic Acid Acetate

Mixed-mode oscillations in the electrodissolution of copper in acetic acid/acetate buffer

1994 ◽  
Vol 39 (7) ◽  
pp. 917-920 ◽  
Author(s):  
Punit Parmananda ◽  
Howard D. Dewald ◽  
R.W. Rollins
Keyword(s):  
Acetic Acid ◽  
Mixed Mode ◽  
Acetate Buffer ◽  
Mixed Mode Oscillations ◽  
Acetic Acid Acetate

Influence of the acidity on the kinetics of diphenylamine oxidation by peroxodisulfate anions

1993 ◽  
Vol 71 (2) ◽  
pp. 167-174 ◽  
Author(s):  
M. Balón ◽  
P. Guardado ◽  
C. Carmona ◽  
J. Hidalgo ◽  
M. A. Munoz
Keyword(s):  
Acetic Acid ◽  
Decomposition Products ◽  
Kinetic Rate ◽  
Rate Law ◽  
Rate Determining Step ◽  
Water Media ◽  
Acid Catalyzed ◽  
Radical Traps ◽  
Kinetics Of ◽  
Acetic Acid Acetate

A kinetic study is reported on the oxidation of diphenylamine (DPA) by peroxodisulfate (PDS) anions in H2SO4 and buffered acetic acid – acetate 20% v/v methanol–water media. The primary detectable product of the reaction is N-phenyl-p-benzoquinoneimine (PBQ), which undergoes acid-catalyzed hydrolysis giving different decomposition products. At pH > 4 (acetic acid – acetate buffers) the hydrolytic decomposition is very slow and it does not interfere with PBQ formation, but in H2SO4 media of pH < 2.5, PBQ decomposes as it is formed. In these media, the reaction obeys the kinetic rate law:[Formula: see text]a, the kinetic parameter, being acid dependent. Neither radical promoters (Ag+) nor radical traps (allyl alcohol) influence the reaction rate. In acetic acid – acetate buffers of pH > 4 the kinetic rate law is simple: first order in each one of the reactants, and acid independent. These results have been interpreted by assuming the formation, in a preequilibrium step, of an N-diphenylhydroxylamine-O-sulfonate intermediate, which further rearranges to yield PBQ. The rate-determining step of the reaction changes with the protonation state of the intermediate, whose protonation pKa has been kinetically estimated as 2.4.

Kinetics and mechanism of oxidation of hydroxylamine by hexachloroiridate(IV) ion in buffer solutions

1993 ◽  
Vol 71 (12) ◽  
pp. 2164-2170 ◽  
Author(s):  
Ms. Rekha ◽  
Aditya Prakash ◽  
Raj N. Mehrotra
Keyword(s):  
Acetic Acid ◽  
Spectral Analysis ◽  
Rate Constants ◽  
Main Product ◽  
Activation Parameters ◽  
Acetate Buffer ◽  
Stopped Flow ◽  
Stoichiometric Ratio ◽  
Buffer Solutions ◽  
Mechanism Of Oxidation

The oxidation of hydroxylammonium ion by [IrCl6]2− ion in acetic acid – acetate buffer solutions, studied by stopped flow, has the stoichiometric ratio Δ[IrCl6]2−/Δ[NH2OH] = 1. The oxidation involves the species [IrCl6]2− and NH3OH+ although spectral analysis of the spent reaction mixture indicates [IrCl5(OH2)]2− to be the main product (almost to the extent of 80%). This anomaly arises because of the aquation of the reduced product [IrCl6]3−. The rate is retarded both by H+ and Cl− ions and the plots of [Formula: see text] against respective concentrations are linear. The proposed mechanism is given by reactions [i]–[v].[Formula: see text]The values of the rate constants at 25 °C are as follows: k1 = 147 dm3 mol−1 s−1 and 102ketKia = 2.8 s−1. The related activation parameters are [Formula: see text], and,[Formula: see text], and [Formula: see text] and [Formula: see text], respectively. The value of Kipd is 2.91 ± 0.03 mol dm−3 and that of Kipa (= 1/Kipd) is 0.344 ± 0.004 dm3 mol−1; both values are almost independent of temperature.

Electron Microprobe Analyses of the Remineralization of Enamel

1970 ◽  
Vol 49 (3) ◽  
pp. 621-625 ◽  
Author(s):  
Stephen H.Y. Wei
Keyword(s):  
Acetic Acid ◽  
Electron Microprobe ◽  
Potassium Acetate ◽  
Enamel Surface ◽  
Acetate Buffer ◽  
Demineralized Enamel ◽  
Calcium And Phosphorus

The electron microprobe was used to analyze the calcium and phosphorus concentrations of sound, acid-etched, and remineralized enamel. By use of a weak acetic acid-potassium acetate buffer, it was found that the demineralization probably affected only the first 10 micrometers of the enamel surface. This demineralized enamel was successfully remineralized by the use of a calcifying solution. The changes in calcium and phosphorus concentrations and the Ca/P ratios were determined.

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