THE MONO-OXALATO COMPLEXES OF IRON(III): PART I. EQUILIBRIA

Abstract

The formation of the mono-oxalato complexes of iron(III) has been examined spectrophotometrically at ionic strength 0.50, between 5 and 25 °C and hydrogen ion concentrations 0.2 to 0.5 M. Evidence is presented that the protonated complex FeHC 2 O 4 ++ is present in significant concentration in these solutions. The formation quotients of the species FeC 2 O 4 ++ and FeHC 2 O 4 ++ for temperatures 5, 15, and 25 °C have been determined and the extinction coefficients at 310 mμ have been estimated.