What name should be used for the ionic compound Co sub 2 open paren SO sub 4 close paren sub 3 ?

The polyatomic ion SO₄²⁻ is called sulfate. Three sulfate ions have a total charge of −6, so the two cobalt ions must total +6; each cobalt is therefore Co³⁺. Transition-metal charges are shown with Roman numerals, so Co₂(SO₄)₃ is cobalt(III) sulfate.

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