Abstract
Ion-pair formation constants (Kn0, n = 1, 2) of Na2SO4, Na2S2O3, Na2CrO4, CaCl2, CdCl2, CdBr2, and CdI2 in water were determined at 298 K and an ionic strength of 0 mol·dm−3 by potentiometry with Na+-, Cl−-, Br−-, and I−-selective electrodes. Simultaneously, equations for the Kn0 determination based on the DeFord−Hume method were derived. The thus-obtained K10 values for Na2SO4, Na2S2O3, CdCl2, and CaCl2 were compared with those reported before, and the validity of their values was confirmed. Interactions of Na+ with oxo anions (X2−) and Cd2+ with the halide ions in water were characterized by considering hydration to and Coulombic forces acting between these ions. Then, a difference in K10 between CdI+ and NaSO4− was interpreted as that in the Coulombic force between the pairing ions. Also, the K10 difference between Na+BPh4− and Ph4As+Cl− or CaCl+ and NaSO4− was examined by using a thermodynamic cycle of these salts in a water/nitrobenzene (NB) distribution system. Furthermore, the distribution constant...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
