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A reasonable man in Black Rock came upon a plastic container with a purple powder. The label on the bottle indicated [co(ox)3}^4-. he brings it to the lab and asks you to investigate the degree of magnetism. (c) determine the diagmagnetic correction calculation for Ueff using magnetic corrections for ions and molecules (10^-6)
Accepted Answer
The complex ion [Co(ox)3]^4- is paramagnetic. Here's why:
1. Cobalt(II) Ion: Cobalt in this complex has a +2 charge (Co²⁺). Its electron configuration is [Ar] 3d⁷.
2. Oxalate Ligand: The oxalate ligand (ox) is a bidentate ligand, meaning it binds to the metal ion through two donor atoms (oxygen in this case).
3. Crystal Field Theory: In the octahedral geometry of [Co(ox)3]^4-, the d-orbitals of Co²⁺ split into two sets: a lower energy set (t2g) and a higher energy set (eg). The oxalate ligands are weak field ligands, meaning they do not cause a large splitting of the d-orbitals.
4. Electron Configuration: The seven d-electrons of Co²⁺ will fill the t2g orbitals first, leaving three unpaired electrons in the eg orbitals.
5. Paramagnetism: The presence of unpaired electrons makes the complex paramagnetic, meaning it is attracted to an external magnetic field.
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