The correct formula of Tetraammine aqua bromocobalt (III) nitrate is:
Correct answer: A. [Co(NH3 )4 (H2 O)Br](NO3 )2 .
- A. [Co(NH3 )4 (H2 O)Br](NO3 )2 .
- B. [Co(NH3 ) (H2 O)Br](NO3 )2 .
- C. Co[Br(H2O)(NH3)4](NO3)2
- D. Co[(NO)(NH3)4(H2O)Br](NO3)2
Explanation
Central metal ion: The central metal is cobalt (Co), and its oxidation state is +3(indicated by "III").Ligands:NH3 (ammine) is a neutral ligand, with four present ("tetraammine").H2O (aqua) is a neutral ligand, with one present.Br (bromo) is a negatively charged ligand, with one present.Overall charge of the complex:Cobalt's oxidation state is +3The ligands contribute as follows: NH3 and H2O are neutral, and Br− contributes −1Thus, the charge of the complex ion is +2Counter ions: Nitrate (NO3−) ions balance the charge of the complex. Since the complex has a +2 charge, two nitrate ions are required as counter ions.Formula construction: Ligands are listed in alphabetical order within the square brackets, followed by the counter ions outside.Hence, the formula is [Co(NH3)4(H2O)Br](NO3)2
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