Thermodynamics of transfer of some univalent ions from the aqueous phase into the nitrobenzene phase of a two-phase water-nitrobenzene extraction system

1983 ◽  
Vol 158 (2) ◽  
pp. 269-276 ◽  
Author(s):  
Emanuel Makrlík ◽  
Le Quoc Hung
Keyword(s):  
Aqueous Phase ◽  
Extraction System ◽  
Two Phase ◽  
Nitrobenzene Phase ◽  
Thermodynamics Of Transfer ◽  
Phase Water

scholarly journals Stability of the barium-benzo-15-crown-5 complex in nitrobenzene saturated with water

2006 ◽  
Vol 71 (11) ◽  
pp. 1147-1151 ◽  
Author(s):  
E. Makrlík ◽  
P. Vaňura
Keyword(s):  
Stability Constant ◽  
Aqueous Phase ◽  
Extraction Constant ◽  
Two Phase ◽  
Nitrobenzene Phase ◽  
Activity Measurements ◽  
System L ◽  
Exchange Extraction ◽  
Phase Water ◽  
The Stability

From extraction experiments and ?-activity measurements, the exchange extraction constant corresponding to the equilibrium Ba2+(aq) + SrL2 2+(nb) _ BaL 2 2+(nb) + Sr2+(aq) occurring in the two-phase water-nitrobenzene system (L = benzo-15-crown-5; aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log K ex (Ba2+, SrL22+) = 0.3 ? 0.1. Furthermore, the stability constant of the benzo-15-crown-5-barium complex in nitrobenzene saturated with water was calculated for the temperature of 25 ?C: log ?nb (BaL2 2+) = 13.3?0.1.

Ionic product of water in the nitrobenzene phase of the two-phase water-nitrobenzene extraction system

1991 ◽  
Vol 56 (4) ◽  
pp. 760-763
Author(s):  
Emanuel Makrlík
Keyword(s):  
Thermodynamic Parameters ◽  
Extraction System ◽  
Two Phase ◽  
Nitrobenzene Phase ◽  
Ionic Product ◽  
Phase Water ◽  
General Relations

General relations among thermodynamic parameters, which characterize the transfer of the ions H+ and OH- from the aqueous into nitrobenzene phase of the two-phase water-nitrobenzene extraction system and dissociation equilibria of H2O in both phases of this system, have been derived. Further, using the known parameters ionic product of water in nitrobenzene saturated with water has been evaluated for a temperature of 25°C: PnbH2O = 10-29.2 mol2 dm-6.

Chemical equilibria including particles I-, I3-, I5-, and I2 in two-phase water-nitrobenzene extraction system

1990 ◽  
Vol 55 (11) ◽  
pp. 2602-2605 ◽  
Author(s):  
Emanuel Makrlík
Keyword(s):  
Thermodynamic Parameters ◽  
Aqueous Phase ◽  
Equilibrium Constants ◽  
Extraction System ◽  
Two Phase ◽  
Chemical Equilibria ◽  
Phase Water ◽  
General Relations ◽  
Homogeneous Reactions

General relations among thermodynamic parameters characterizing chemical equilibria with species I-, I3-, I5-, and I2 in the two-phase water-nitrobenzene extraction system have been derived. Furthermore, these relations have been used for calculating equilibrium constants K1aq(I3-) and K2aq(I5-) corresponding to homogeneous reactions I-(aq) + I2(aq) ⇄ I3-(aq) and I3-(aq) + I2(aq) ⇄ I5-(aq) proceeding in the aqueous phase of the system under study. Finally, stability of polyiodides I3- and I5- in both phases has been discussed.

Contribution to the thermodynamics of bromophenol blue in the two-phase water-nitrobenzene extraction system

1990 ◽  
Vol 55 (11) ◽  
pp. 2606-2609 ◽  
Author(s):  
Emanuel Makrlík
Keyword(s):  
Equilibrium Distribution ◽  
Dissociation Constants ◽  
Extraction System ◽  
Bromophenol Blue ◽  
Phase Extraction ◽  
Distribution Constant ◽  
Two Phase ◽  
Nitrobenzene Phase ◽  
Phase Water ◽  
General Relations

General relations among thermodynamic parameters characterizing dissociation equilibria with species H2A, HA- and A2- (H2A is a symbol for an electroneutral undissociated acid) in a two-phase extraction system have been derived. From the extraction measurements, the equilibrium distribution constant of electroneutral bromophenol blue between the nitrobenzene phase and the aqueous one has been determined: log KD(H2A) = 3.60 ± 0.01. By using this value and further known constants and applying the mentioned relations the following values of dissociation constants of bromophenol blue in nitrobenzene saturated with water have been calculated for a temperature of 25 °C: pKaorg(H2A) = -log Kaorg(H2A) = 10.1 and pKaorg(HA-) = -log Kaorg(HA-) = 14.5.

scholarly journals Extraction of calcium from water into nitrobenzene using strontium dicarbollylcobaltate in the presence of 18-crown-6

2000 ◽  
Vol 65 (4) ◽  
pp. 275-279
Author(s):  
Marcela Danková ◽  
Emanuel Makrlík ◽  
Petr Vanura
Keyword(s):  
Stability Constant ◽  
Aqueous Phase ◽  
Extraction Constant ◽  
Two Phase ◽  
Nitrobenzene Phase ◽  
Activity Measurements ◽  
System L ◽  
Phase Water ◽  
The Stability

From extraction experiments and g-activity measurements, the extraction constant corresponding to the equilibrium Ca 2+ (aq)+ SrL 2+ (nb) === CaL 2+ (nb) + Sr 2+ (aq) taking place in the two-phase water-nitrobenzene system(L= 18-crown-6, aq = aqueous phase, nb = nitrobenzene phase) was evaluated as log Kex(Ca 2+, SrL 2+) = -1.9 ?0.1. Furthermore, the stability constant of the calcium - 18-crown-6 complex in nitrobenzene saturated with water was calculated for the temperature of 25?C: log bnb (CaL 2+)=10.1?0.1.

scholarly journals Distribution of micro-amounts of europium in the two-phase water-HCl-nitrobenzene-N,N'-dimethyl-N,N'-diphenyl-2,6-dipicolinamide-hydrogen dicarbollylcobaltate extraction system

2009 ◽  
Vol 74 (7) ◽  
pp. 781-787 ◽  
Author(s):  
Emanuel Makrlík ◽  
Petr Vaňura ◽  
Pavel Selucký ◽  
Vasily Babain ◽  
Ivan Smirnov
Keyword(s):  
Stability Constants ◽  
Organic Phase ◽  
Extraction And Stability Constants ◽  
Extraction System ◽  
Hydrogen Dicarbollylcobaltate ◽  
Nitrobenzene Solution ◽  
Two Phase ◽  
Equilibrium Data ◽  
Phase Water

Extraction of micro-amounts of europium by a nitrobenzene solution of hydrogen dicarbollylcobaltate (H+B-) in the presence of N,N'-dimethyl- -N,N'-diphenyl-2,6-dipicolinamide (MePhDPA, L) was investigated. The equilibrium data were explained assuming that the species HL+, + HL2 , 3+ EuL2 and 3+ EuL3 are extracted into the organic phase. The values of the extraction and stability constants of the species in nitrobenzene saturated with water were determined.

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