The charge on the metal ion in the coordination complex ion, [Co(CO₃)₃]³, is:

Name: The charge on the metal ion in the coordination complex ion, [Co(CO 3 ) 3 ] 3 , is:
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The coordination complex [Co(CO3)3]3- has a 3- charge overall. Each carbonate ion (CO3) has a 2- charge, so three carbonate ions contribute a total of 6- charge. To balance this and achieve the overall 3- charge of the complex, the cobalt ion must have a 3+ charge.

The Charge on the Metal Ion in the Coordination Complex