Abstract
Summary The electrode reaction Cr(III)+ e →Cr(II) was studied in concentratedsolutions of NaClO 4 , Ca(ClO 4 ) 2 , NaCl and CaCl 2 . In perchlorate solutions the formal potentials, standard rate constants and electrode reaction orders were determined. From these data the hydration numbers were estimated and the mechanism of the electrode system studied was discussed. The rate constant of the Cr(III)/Cr(II) system is practically independent of the perchlorate concentration. The electrode reaction proceeds much faster in concentrated calcium chloride. In addition the Cr(II)/Cr system at a mercury electrode in concentratedsolutions of sodium perchlorate and calcium chloride was studied.
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