SUSAN L. S. STIPP, GEORGE A. PARKS
Considerable disparity exists in the published thermodynamic data for selected species in the Cd(II)-CO2-H2O system near 25°C and 1 atm pressure. The objective of this study was to evaluate published experimental and estimated data for aqueous cadmium-carbonate species. We suggest an association constant, pK, of -3.0 ± 0.4 for CdCO3, about -1.5 for CdHCO3, and -6.4 ± 0.1 for Cd(CO3)2- (T = 298.15 K, P = 1 atm; I = 0). We examined all available data for cadmium-hydrolysis species and confirmed that the consistent set of constants presented by Baes and Mesmer is the best available. The solubility of synthetic otavite, CdCO3(,), has been measured in KClO4 solutions where I = 0.1 M. We calculated pKSp = 12.1 ± 0.1 (T = 25.0°C; P = 1 atm; I = 0) from measured concentrations of Cd2+, measured PCO2, and pH, alongside our selected set of equilibrium constants and activity corrections estimated using the Davies equation. Additionally, we recommended a new set of thermodynamic properties for otavite based on new solubility data.
@article{8eacdb1a-9014-499b-b32e-e317c6f383d0,
title={Solubility-product constant and thermodynamic properties for synthetic otavite, CdC03(,), and aqueous association constants for the Cd( II)-C02-Hz0 system},
author={SUSAN L. S. STIPP and GEORGE A. PARKS},
year={1993},
language={en}
}TY - JOUR TI - Solubility-product constant and thermodynamic properties for synthetic otavite, CdC03(,), and aqueous association constants for the Cd( II)-C02-Hz0 system AU - SUSAN L. S. STIPP AU - GEORGE A. PARKS PY - 1993 LA - en ER -
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