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Copper(II) oxide solubility behavior in aqueous sodium phosphate solutions at elevated temperatures

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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.

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Ziemniak, S.E., Jones, M.E. & Combs, K.E.S. Copper(II) oxide solubility behavior in aqueous sodium phosphate solutions at elevated temperatures. J Solution Chem 21, 179–200 (1992). https://doi.org/10.1007/BF00647007

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Key Words

  • Copper oxide
  • aqueous solutions
  • metal ion hydrolysis
  • phosphato complexing
  • equilibrium constant
  • thermodynamics
  • pressurized water
  • hydrothermal solutions
  • corrosion