Activity Coefficients of Tris(ethylenediamine)cobalt(III) Hexacyanoferrate(III) in Water and Mixed Water-Alcohol Solvents

1993 ◽  
Vol 58 (8) ◽  
pp. 1791-1797 ◽  
Author(s):  
Vladislav Holba
Keyword(s):  
Aqueous Solution ◽  
Activity Coefficients ◽  
Transfer Functions ◽  
Butyl Alcohol ◽  
Alcohol Solvents ◽  
Mixed Water ◽  
Mean Activity Coefficients ◽  
Water Alcohol

The solubility of tris(ethylenediamine)cobalt(III) hexacyanoferrate(III) were measured in aqueous solution of NaClO4, NaCl, KCl, KBr, K2SO4, Mg2SO4, (CH3)4NBr, (C2H5)4NBr, (1-C3H7)4NBr, and (1-C4H9)4NBr, as well as in the solution of NaClO4 in mixtures of water with methanol and tert-butyl alcohol. The experimental mean activity coefficients are compared with theoretical ones evaluated with the aid of extended Debye-Huckel relation. From the solubilities in water and in water-alcoholic solvents the thermodynamic transfer functions of the saturating salt were calculated.

Activity Coefficients and Gibbs Energies of Transfer of Tetraalkylammonium Dianilinetetraisothiocyanatochromates(III)

1994 ◽  
Vol 59 (8) ◽  
pp. 1738-1744
Author(s):  
Vladislav Holba
Keyword(s):  
Activity Coefficients ◽  
Transfer Functions ◽  
Butyl Alcohol ◽  
Methyl Ethyl ◽  
Tetraalkylammonium Ions ◽  
Ionic Transfer ◽  
Gibbs Energies ◽  
Gibbs Energies Of Transfer ◽  
Acetonitrile Solutions ◽  
Mixed Systems

The solubilities of tetraalkylammonium dianilinetetraisothiocyanatochromates(III) (alkyl = methyl, ethyl, 1-propyl, and 1-butyl) in water, water - methanol, water - tert-butyl alcohol and water - acetonitrile solutions were measured at 25 °C. The results were used to evaluate the activity coefficients and Gibbs energies of transfer of the saturating salts from water to the mixed systems. The Gibbs energies of transfer of the [Cr(C6H5NH2)2(NCS)4]- ion were obtained by means of known ionic transfer functions for the tetraalkylammonium ions based on the TATB assumption.

Kinetics of aquation of bromopentaamminechromium(III) and bromopentaamminecobalt(III) ions in water-alcohol solvents

1979 ◽  
Vol 44 (2) ◽  
pp. 495-501 ◽  
Author(s):  
Vladislav Holba ◽  
Oľga Grančičová
Keyword(s):  
Reaction Kinetics ◽  
Rate Constants ◽  
Compensation Effect ◽  
Activation Parameters ◽  
Butyl Alcohol ◽  
Isokinetic Temperature ◽  
Tert Butyl Alcohol ◽  
Alcohol Solvents ◽  
Kinetics Of ◽  
Water Alcohol

The rate constants and activation parameters of aquation of bromopentaamminechromium(III) and bromopentaamminecobalt(III) ions were determined in mixtures of water with methanol, ethanol, 2-propanol, and tert-butyl alcohol. A compensation effect was observed in the first three mixtures and the isokinetic temperature was determined. The rate constant were correlated with the ionizing strength of the solvent. The influence of interactions between the water and alcohol molecules on the reaction kinetics is discussed.

Solubility of Tris(ethylenediamine)chromium(III) and Hexaureachromium(III) Hexacyanoferrates(III) in Water and Mixed Water-Organic Solvents

1995 ◽  
Vol 60 (4) ◽  
pp. 537-544 ◽  
Author(s):  
Vladislav Holba ◽  
Marcela Hanková
Keyword(s):  
Experimental Data ◽  
Aqueous Solutions ◽  
Binary Mixtures ◽  
Organic Solvents ◽  
Activity Coefficients ◽  
Butyl Alcohol ◽  
Gibbs Energies ◽  
Gibbs Energies Of Transfer ◽  
Mixed Water

The solubilities of tris(ethylenediamine)chromium(III) and hexa(urea)chromium(III) hexacyanoferrates(III) in aqueous solutions of different supporting electrolytes as well as in binary mixtures of water with methanol, tert-butyl alcohol and acetonitrile were measured at 25 °C. The experimental data have been used to evaluate the activity coefficients of the saturating salts in water and their Gibbs energies of transfer from water into the binary mixtures investigated.

Thermodynamic and Kinetic Investigation of the Solvent Effect on the Oxidation of [Co(en)2SCH2COO]+ with S2O82- In Water-Methanol and Water-tert-Butyl Alcohol Mixtures

1993 ◽  
Vol 58 (5) ◽  
pp. 1001-1006 ◽  
Author(s):  
Oľga Vollárová ◽  
Ján Benko
Keyword(s):  
Transfer Functions ◽  
Activation Parameters ◽  
Butyl Alcohol ◽  
Oxidation Of Co ◽  
Kinetics Of Oxidation ◽  
Tert Butyl ◽  
Tert Butyl Alcohol ◽  
Alcohol Mixtures ◽  
Kinetics Of

The kinetics of oxidation of [Co(en)2SCH2COO]+ with S2O82- was studied in water-methanol and water-tert-butyl alcohol mixtures. Changes in the reaction activation parameters ∆H≠ and ∆S≠ with varying concentration of the co-solvent depend on the kind of the latter, which points to a significant role of salvation effects. The solvation effect on the reaction is discussed based on a comparison of the transfer functions ∆Ht0, ∆St0 and ∆Gt0 for the initial and transition states with the changes in the activation parameters accompanying changes in the CO-solvent concentration. The transfer enthalpies of the reactant were obtained from calorimetric measurements.

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