How would you account for the following:
Cobalt(II) is stable in aqueous solution but in the presence of complexing reagents it is easily oxidised.
Co(II) is stable in aqueous solutions. However, in the presence of strong field complexing reagents, it is oxidized to Co (III). Although the 3rd ionization energy for Co is high, but the higher amount of crystal field stabilization energy (CFSE) released in the presence of strong field ligands overcomes this ionization energy.
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