ISSN:
1572-8927
Keywords:
Copper oxide
;
aqueous solutions
;
metal ion hydrolysis
;
phosphato complexing
;
equilibrium constant
;
thermodynamics
;
pressurized water
;
hydrothermal solutions
;
corrosion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract A platinum-lined, flowing autoclave facility is used to investigate the solubility behavior of copper(II) oxide (CuO) in aqueous sodium phosphate solutions at temperatures between 19 and 262°C. Copper solubilities are observed to increase continuously with temperature and phosphate concentration. The measured solubility behavior is examined via a Cu(II) ion hydrolysis/complexing model and thermodynamic functions for the hydrolysis/complexing reactions are obtained from a leastsquares analysis of the data. Altogether, thermochemical properties are established for five anionic complexes: Cu(OH) 3 − , Cu(OH) 4 2− , Cu(OH) 2 (HPO 4 ) 2− , Cu(OH) 3 (H 2 PO 4 ) 2− , and Cu(OH) 2 (PO 4 ) 3− . Precise thermochemical parameters are also derived for the Cu(OH)+ hydroxocomplex based on CuO solubility behavior previously observed (Ref. 3) for pure water at elevated temperatures. The relative ease of Cu(II) ion hydrolysis is such that Cu(OH) 3 − species become the preferred hydroxocomplex for pH≥9.4.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00647007
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