ChemInform Abstract: VAPOR PRESSURE STUDY OF THE DEUTERIUM EXCHANGE REACTION IN METHANOL-ETHANOL SYSTEMS: EQUILIBRIUM CONSTANT DETERMINATION

1981 ◽  
Vol 12 (1) ◽  
Author(s):  
Z. S. KOONER ◽  
D. V. FENBY
Keyword(s):  
Vapor Pressure ◽  
Equilibrium Constant ◽  
Exchange Reaction ◽  
Deuterium Exchange ◽  
Constant Determination

Vapour pressure study of the deuterium exchange reaction in methanol-ethanol systems: equilibrium constant determination

1980 ◽  
Vol 33 (9) ◽  
pp. 1943 ◽  
Author(s):  
ZS Kooner ◽  
DV Fenby
Keyword(s):  
Equilibrium Constant ◽  
Exchange Reaction ◽  
Vapour Pressure ◽  
Deuterium Exchange ◽  
Pressure Measurements ◽  
Molar Excess ◽  
Constant Determination ◽  
Good Agreement

The equilibrium constant of the reaction ���������������������� CH3OH(1)+C2H5OD(1) → CH3OD(1)+C2H5OH(1) is obtained from vapour pressure measurements on methanol+ethanol systems. The value obtained, 1.03�0.01 at 298 K, is in good agreement with that calculated independently from previously reported vapour pressure studies of water+methanol and water+ethanol systems. Vapour pressures at 298.15 K are reported for the systems CH3OH+C2H5OH, CH3OH+C2H5OD, CH3OD+C2H5OH and CH3OD+C2H5OD. Molar excess Gibbs functions are obtained from these vapour pressures.

Vapour Pressure Study of Deuterium Exchange Reactions in Water-Ethanol Systems: Equilibrium Constant Determination

1979 ◽  
Vol 32 (11) ◽  
pp. 2353 ◽  
Author(s):  
RC Phutela ◽  
ZS Kooner ◽  
DV Fenby
Keyword(s):  
Liquid Phase ◽  
Equilibrium Constant ◽  
Vapour Pressure ◽  
Equilibrium Constants ◽  
Deuterium Exchange ◽  
Pressure Measurements ◽  
Exchange Reactions ◽  
Molar Excess ◽  
Constant Determination

A method is proposed for the determination of the equilibrium constants of liquid-phase deuterium exchange reactions from vapour pressure measurements. It is applied to water-ethanol systems to give the equilibrium constant of the reaction 2C2H5OH(l) + D2(l) → 2C2H5OD(l) + H2O(l) The value obtained, 1.05+0.02 at 298 K, is significantly greater than the 'random' value and is more precise and reasonable than a recent calorimetric estimate. Vapour pressures at 298.14 K are reported for the systems H2O+C2H5OH, H2O+C2H5OD, D2O + C2H5OH and D2O + C2H5OD. Molar excess Gibbs functions are obtained from these vapour pressure measurements.

Fundamentals of Electrochemistry

2021 ◽  
pp. 389-411
Author(s):  
Christopher O. Oriakhi
Keyword(s):  
Free Energy ◽  
Equilibrium Constant ◽  
Electrode Potential ◽  
Electrolytic Cell ◽  
Electrochemical Cells ◽  
Standard Electrode Potential ◽  
Cell Potential ◽  
Oxidation Reduction ◽  
Constant Determination

Fundamentals of Electrochemistry build on basic oxidation-reduction reactions and present an overview of their use in electrochemical cells. The construction and operation of a galvanic cell is described with cell diagrams including the function of the electrodes (cathode and anode). Also covered are the standard electrode potential and its applications, including calculations involving the standard electrode potential, the Gibbs free energy and the equilibrium constant, determination of the spontaneity in redox reactions and the dependence of cell potential on concentration (the Nernst equation). Finally a qualitative and quantitative overview of electrolysis is presented with a focus on predicting the products of electrolysis and the stoichiometry of electrolysis, which relates the charge flowing through an electrolytic cell to the amount of products formed at the electrodes.

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