A-LevelChemistryChemical periodicityOct/Nov 2023Paper 4 Q48 Marks
The structure of the polydentate ligand, EDTA4—, is shown in Fig. 4.1. :0: :0: :O-CCH2 CH2C-O: NCH₂CH₂N :O-CCH CH₂C- :0: :0: Fig. 4.1 The stability constants, at 298K, of five octahedral complexes are given in Table 4.1. Table 4.1 complex Kstab [Cu(EDTA)]2- 6.31 x 1019 [Cr(EDTA)]2- 1.00 x 1013 [Cr(EDTA)]- 1.00 x 1024 [Fe(EDTA)]2- 2.00 x 1014 [Fe(EDTA)]- 1.26 x 1025
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