345684.fig.001
Figure 1: The potentiometric titration curves of the Sc(III) : Phen complexes in 0.1 M at 25°C. (m = mmoles of base (sodium hydroxide) added per mmole of ligand). (I) Phen alone ( = 9.668 × 10−2 M). (II) (1 : 1) Sc(III) : Phen ( = 9.668 × 10−2 M, = 9.668 × 10−2 M). (III) (1 : 2) Sc(III) : Phen ( = 9.668 × 10−2 M, = 1.934 × 10−1 M). (IV) (1 : 3) Sc(III) : Phen ( = 9.668 × 10−2 M, = 2.900 × 10−1 M).