Abstract
Stability constants of hafnium(IV) nitratocomplexes have been measured by means of the competitive solvent extraction method at ionic strength of 4·0 M. Corrections have been made for the incomplete dissociation of nitric acid. In the range of equilibrium nitrate concentration of 2·0–3·8 M the Hf(NO 3) 3+ and Hf(NO 3) 2 2+ complexes have been identified with overall stability constants of β 1 = 0·40 and β 2 = 0·05 respectively. The stability of the Hf(NO 3) 3+ complex is discussed with respect to the extraction of the Hf(TTA) 3NO 3 mixed complex.
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