Estimation of Thermodynamic Equilibrium Constant for Binary and Ternary Cation Exchange Reactions Using Rothmund–Kornfeld and Regular Solution Models in Some Soils and Soil Clays

2020 ◽  
Vol 38 (4) ◽  
pp. 472-483
Author(s):  
Maryam Khalili Rad ◽  
Hasan Towfighi
Keyword(s):  
Cation Exchange ◽  
Equilibrium Constant ◽  
Regular Solution ◽  
Thermodynamic Equilibrium ◽  
Exchange Reactions ◽  
Thermodynamic Equilibrium Constant ◽  
Soil Clays ◽  
Solution Models

The equilibrium constant of the reaction Cr2O72- + H2O ↔ 2HCrO,4- at 15° to 45°

1968 ◽  
Vol 21 (6) ◽  
pp. 1445 ◽  
Author(s):  
HG Linge ◽  
AL Jones
Keyword(s):  
Acid Solution ◽  
Equilibrium Constant ◽  
Thermodynamic Equilibrium ◽  
Thermodynamic Equilibrium Constant

The equilibrium Cr2O2-7,+H2O + 2HcrO4 has been studied in acid solution spectrophotometrically. Values have been obtained for the thermodynamic equilibrium constant at 15°, 25°, 35°, and 45°.

On N-acetylcysteine. Part I. Experimental and theoretical approaches of the N-acetylcysteine/H2O2complexation

1994 ◽  
Vol 72 (10) ◽  
pp. 2094-2101 ◽  
Author(s):  
Jlil Arroub ◽  
Jacqueline Bergès ◽  
Zohreh Abedinzadeh ◽  
Jacqueline Langlet ◽  
Monique Gardès-Albert
Keyword(s):  
Hydrogen Peroxide ◽  
Complex Formation ◽  
Solvent Effect ◽  
Equilibrium Constant ◽  
Thermodynamic Equilibrium ◽  
Continuum Model ◽  
Theoretical Calculations ◽  
Thermodynamic Equilibrium Constant ◽  
Theoretical Approaches ◽  
Biphasic Process

The complexation of N-acetylcysteine (RSH) with hydrogen peroxide has been studied experimentally and theoretically. Experimentally we have measured the evolution of RSH, H2O2, and RSSR (N-acetylcystine) as a function of time. Surprisingly, H2O2 decays by a biphasic process, which is not the case for RSH and RSSR. In the first stage of the kinetics, H2O2 disappears without oxidizing the thiol function of RSH. By analogy with glutathione (GSH), the formation of a complex between RSH and H2O2 has been proposed. The thermodynamic equilibrium constant of complex formation has been determined. Theoretical calculations were performed within the SIBFA method to pinpoint the sites of complexation in isolated and hydrated states. A mixed "discrete–continuum" model was used to evaluate the solvent effect. The two stable complexes found in isolated state have different behaviour under the influence of the solvent. Comparison with complexed GSH is discussed.

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