Studies on thermodynamic properties of copper in molten NaOH

Hidetaka Hayashi, Shiro Yoshizawa, Yasuhiko Ito

Research output: Contribution to journalArticle

Abstract

Thermodynamic behaviour of copper in molten NaOH at 623K (350°C) has been studied. The solubility product of cupric oxide, Ksp-2, was determined to be 2.5 × 10-12 by chemical analysis. The standard potential of the Cu Cu+ couple was found to be 1.97 V vs Na Na+ and that of the Cu+ Cu2 couple was 1.87 V vs Na Na+, respectively. Moreover, the standard potential of the Cu Cu2O and Cu2O CuO couples were determined by the use of stabilized zirconia and compared with the values derived from published thermochemical data. Finally Ksp-1, the solubility product of cuprous oxide, was evaluated to be 3.0 × 10-15. From the experiment, the following conclusions were obtained. 1. In this system, copper can be oxidized to its divalent state, such as cupric oxide or cupric ion, through its univalent state, such as cuprous ion or cuprous oxide, in the presence of oxygen. 2. Solubility products of the oxides of copper are much larger than that of nickel oxide, which behaves as a protective film. Thus, copper is not suitable for materials to be used in this media.

Original languageEnglish
Pages (from-to)1389-1394
Number of pages6
JournalElectrochimica Acta
Volume28
Issue number10
DOIs
Publication statusPublished - 1983
Externally publishedYes

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Molten materials
Copper
Thermodynamic properties
Oxides
Solubility
Protective coatings
Nickel oxide
Ions
Zirconia
Thermodynamics
Oxygen
Chemical analysis
Experiments
cuprous oxide
cupric oxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Analytical Chemistry
  • Electrochemistry

Cite this

Studies on thermodynamic properties of copper in molten NaOH. / Hayashi, Hidetaka; Yoshizawa, Shiro; Ito, Yasuhiko.

In: Electrochimica Acta, Vol. 28, No. 10, 1983, p. 1389-1394.

Research output: Contribution to journalArticle

Hayashi, Hidetaka ; Yoshizawa, Shiro ; Ito, Yasuhiko. / Studies on thermodynamic properties of copper in molten NaOH. In: Electrochimica Acta. 1983 ; Vol. 28, No. 10. pp. 1389-1394.
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