The oxidation of Cu(I) in electrolyte solutions

Virender K. Sharma, Frank J Millero

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The rates of oxidation of Cu(I) in air saturated solutions was measured as a function of pH, temperature (5-45°C), and ionic strength (0.5 to 6m) in NaCl and NaCl-NaClO4 solutions. In pure NaCl solutions, the effect of pH is independent of ionic strength and temperature. The overall rate constant is given by logk=12.32+0.12(pH)-2064/T-3.69I1/2+ 0.73I The energy of activitation was 39±2 kJ-mol-1 and is independent of ionic strength. At a constant ionic strength (I=1, 3 and 6m) in NaCl-NaClO4 mixtures the Cl- dependence of the rates is attributed to the oxidation of the various forms of Cu(I) in the solution. The rate constants for the oxidation of the various species are found to be functions of ionic strength. At a constant ionic strength (I=1) in NaCl-NaClO4 solutions, the effect of temperature is independent of the chloride concentration. The effect of Mg2+ and HCO3 - on the oxidation rate was determined as a function of chloride concentration (1 to 6m) at 25°C and pH=8. The addition of Mg2+ causes the rate to decrease and the addition of HCO3 - causes the rate to increase. The possible causes of these effects are discussed. Empirical equations for the rate of oxidation of Cu(I) in Na-Mg-Cl-HCO3 solutions as a function of composition are used to make reliable estimates of the oxidation in seawater and Red Sea waters.

Original languageEnglish (US)
Pages (from-to)581-599
Number of pages19
JournalJournal of Solution Chemistry
Volume17
Issue number6
DOIs
StatePublished - Jun 1988

Fingerprint

Ionic strength
Osmolar Concentration
Electrolytes
electrolytes
Oxidation
oxidation
Seawater
Temperature
Chlorides
Rate constants
Indian Ocean
causes
chlorides
Red Sea
sea water
Air
temperature
Water
Chemical analysis
air

Keywords

  • Copper
  • ionic strength
  • NaCl solutions
  • oxidation
  • speciation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

The oxidation of Cu(I) in electrolyte solutions. / Sharma, Virender K.; Millero, Frank J.

In: Journal of Solution Chemistry, Vol. 17, No. 6, 06.1988, p. 581-599.

Research output: Contribution to journalArticle

Sharma, Virender K. ; Millero, Frank J. / The oxidation of Cu(I) in electrolyte solutions. In: Journal of Solution Chemistry. 1988 ; Vol. 17, No. 6. pp. 581-599.
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