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Mixtures of citric acid (H 3 Ci) and Fe(NO 3 ) 3  with variable molar ratios (H 3 Ci/Fe(NO 3 ) 3  from 0 to 2.55) were titrated with NaOH. The change in pH and the occurring inflection points were registered with a potentiograph (Fig. 1). For each inflection point (I.P.) the existing H 3 Ci/Fe(NO 3 ) 3  molar ratio was plotted against the NaOH/Fe(NO 3 ) 3  molar ratio which existed at the corresponding inflection point (at most three I.P. for each titration curve). The coefficients e j , f j  and g j  for each dehydrated

zeitschrift für naturforschung b

Die Komplexbildung der Zitronensäure, II.: Komplexbildung zwischen Zitronensäure und Eisen(III) / The Formation of Complexes of Citric Acid, II The Formation of Complexes of Citric Acid with Iron(III)