2. Explain the following observations: (a) Co(III) forms strong bonds to O- and N-donor ligands, moderately strong bonds to P-donor ligand, and weak bonds to As-donor ligands. (b) EDTA4 forms more stable complexes with trivalent first-row transition metals (M3+) than it does with the corresponding divalent metal (M²+) of each (e.g. Cr²+ vs Cr3+). EDTA is a common ligand which bonds a metal center through four oxygen and two nitrogen atoms in an octahedral geometry (Figure 1). Figure 1. EDTA binds in an octahedral geometry

2. Explain the following observations: (a) Co(III) forms strong bonds to O- and N-donor ligands, moderately strong bonds to P-donor ligand, and weak bonds to As-donor ligands. (b) EDTA4 forms more stable complexes with trivalent first-row transition metals (M3+) than it does with the corresponding divalent metal (M²+) of each (e.g. Cr²+ vs Cr3+). EDTA is a common ligand which bonds a metal center through four oxygen and two nitrogen atoms in an octahedral geometry (Figure 1). Figure 1. EDTA binds in an octahedral geometry

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter14: Applications Of Ultraviolet-visible Molecular Absorption Spectrometry

Section: Chapter Questions

Problem 14.7QAP: A 3.03-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500 mL in a...

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A 3.03-g petroleum specimen was decomposed by wet ashing and subsequently diluted to 500 mL in a volumetric flask. Cobalt was determined by treating 25.00-mL aliquots of this diluted solution as follows: Assume that the Co(II)-ligand chelate obeys Beer’s law, and calculate the percentage of cobalt in the original sample.
In general, would you expect EDTA4- to coordinate to transition metal ions more or less strongly than ethylenediamine does? Justify your answer with a reason other than the different charges on the two ligands.
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