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I know that we add "-ate" to the end of a metal name if the complex has a negative charge (eg: [Ni(CN)4]2- is ...nickelate (II)), but why is it that in some cases, we still use "-ate" even though the complex does not have an overall negative charge? An example would be K3[CoF6], which is named Potassium hexa-fluorido cobaltate (III).
Sometimes we use the "ate" suffix to differentiate between whether it is a cation or an anion. In this specific situation, the coordination sphere has an overall negative charge and therefore we should be indicating that this is an anion.
The complex, which doesn't include the potassium is still negative. The 6 F's create a -6 charge and the Co creates a +3 charge, resulting in an overall -3 charge for the complex. The entire coordination compound, which includes the potassium, is of neutral charge.
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