Diffusion coefficients and electrical conductivities for calcium chloride aqueous solutions at 298.15K and 310.15K

Abstract

a b s t r a c tExperimental values for mutual diffusion coefficients (interdiffusion coefficients) for CaCl 2 aqueous solutions at 298.15 K and 310.15 K, not available in the literature, were experimentally determined between 0.005 mol dm −3 and 0.1 mol dm −3 . The measurements were performed by using a conductimetric openended capillary cell. Values at infinitesimal concentration, D 0 , were also obtained. These data were analysed using the Onsager-Fuoss and Gordon models. In addition, molar conductance data were measured at 310.15 K for CaCl 2 aqueous solutions at the same concentration range and the value at infinitesimal concentration determined. Afterwards, it was split into the ionic limiting values. By replacing them into the Nernst equation, diffusion coefficients at infinitesimal concentration were derived (1.335 × 10 −9 m 2 s −1 and 1.659 × 10 −9 m 2 s −1 ) at both temperatures (298.15 K and 310.15 K, respectively). They agree well with the extrapolated experimental ones (1.312 × 10 −9 m 2 s −1 and 1.613 × 10 −9 m 2 s −1 ).

Computational modelling of local calcium ions release from calcium phosphate-based scaffolds

“…The diffusion coefficient (D) for calcium chloride (CaCl 2 ) in aqueous solutions at 310.15 K has been reported to be (1.601±0.02)×10 −9 m 2 /s (Ribeiro et al 2008) which is of the same order of magnitude that was calculated theoretically in this study.…”

Toward the understanding of hydration phenomena in aqueous electrolytes from the interplay of theory, molecular simulation, and experiment

“…Calcium chloride is an important component frequently found in geological formations and in aqueous solutions involved in industrial processes. For that reason, its aqueous solutions have been the focus of extensive thermodynamic [74][75][76][77][78][79][80] and structural studies by neutron scattering 73,[81][82][83][84][85] , X-ray diffraction (XRD) [86][87][88][89][90][91][92][93] , extended X-ray absorption fine structure (EXAFS) [93][94][95][96][97] , electric conductance [98][99] , and molecular simulation 90,[100][101][102][103][104][105][106] . On the one hand, early wide angle X-ray scattering (WAXS) experiments on concentrated CaCl 2 solutions by Yamaguchi et al 89 and their re-interpretation of previous data from Caminiti et al 88 suggested the presence of CIP configuration at and a…”

Characterization of MK-40 Membrane Modified by Layers of Cation Exchange and Anion Exchange Polyelectrolytes

“…where z 1 and C 1 are the charge and the molar concentration of counterion in solution bulk, respectively; D is the diffusion coefficient of salt in solution; h is the intermembrane distance; T 1 and t 1 are the counterion transport number in membrane and in solution, respectively; V 0 is the linear solution pumping rate; and L is the length of desalination path. D value is taken to be equal to that at infinite dilution and 25 • C, which is 1.61 × 10 −9 m 2 /s for NaCl and 1.335 × 10 −9 m 2 /s for CaCl 2 [62]. For the experimental conditions, T 1 was assumed to be equal to 1 (as the membranes are highly selective for counterions in such dilute solutions, and at currents close to the limiting current density the input of water splitting was found to be negligible), t 1 was 0.603 for Na + in NaCl and 0.438 for Ca 2+ in CaCl 2 , h was 0.59 cm, and L was 2.15 cm.…”