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Inorganics 2017, 5(3), 42; doi:10.3390/inorganics5030042

Silver(I) Extraction with Benzo-18-Crown-6 Ether from Water into 1,2-Dichloroethane: Analyses on Ionic Strength of the Phases and their Equilibrium Potentials

1
Graduate School of Science, Chiba University, Chiba 263-8522, Japan
2
Department of Chemistry, Faculty of Science, Chiba 263-8522, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Duncan H. Gregory
Received: 19 May 2017 / Revised: 23 June 2017 / Accepted: 25 June 2017 / Published: 30 June 2017
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Abstract

Extraction constants (Kex & Kex±) for the extraction of silver picrate (AgPic) by benzo-18-crown-6 ether (B18C6) into 1,2-dichloroethane (DCE) were determined at 298 K and various ionic strength (I)-values of a water phase with or without excess HNO3. Here the symbols, Kex and Kex±, were defined as [AgLPic]DCE/P and [AgL+]DCE[Pic]DCE/P with P = [Ag+][L]DCE[Pic] and L = B18C6, respectively; [ ]DCE refers to the concentration of the corresponding species in the DCE phase at equilibrium. Simultaneously, KD,Pic (= [Pic]DCE/[Pic]) and K1,DCE (= Kex/Kex±) values for given I and IDCE values were determined, where the symbol IDCE shows I of the DCE phase. Also, equilibrium potential differences (Δφeq) based on the Pic transfer at the water/DCE interface were obtained from the analysis of the KD,Pic [= KD,PicS exp{−(F/RT) Δφeq}] values; the symbol KD,PicS shows KD,Pic at Δφeq = 0 V. On the basis of these results, I dependences of logKex and logKex± and IDCE ones of logK1,DCE and logKex± were examined. Extraction experiments of AgClO4 and AgNO3 by B18C6 into DCE were done for comparison. The logKex±-versus-Δφeq plot for the above Ag(I) extraction systems with Pic, ClO4, and NO3 gave a good positive correlation. View Full-Text
Keywords: extraction constants; conditional distribution constants of ions; equilibrium potential difference between water and organic phase; ionic strength; silver salts; benzo-18-crown-6 ether; 1,2-dichloroethane extraction constants; conditional distribution constants of ions; equilibrium potential difference between water and organic phase; ionic strength; silver salts; benzo-18-crown-6 ether; 1,2-dichloroethane
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Kudo, Y.; Ikeda, S.; Morioka, S.; Tomokata, S. Silver(I) Extraction with Benzo-18-Crown-6 Ether from Water into 1,2-Dichloroethane: Analyses on Ionic Strength of the Phases and their Equilibrium Potentials. Inorganics 2017, 5, 42.

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