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Cooper Baddley 3H wrote:Ferrum refers to the latin name for iron and then the compound has an overall negative charge so you add ate to make it ferrate
Cooper is right in this context. Although ferrate is known as the polyatomic ion [FeO4]2-, in this context, ferrate refers to the metal in the coordination compound molecule. Lavelle told us that when writing the names of negatively charged molecules, we take the latin name for the metal, then replace the last letters with the suffix -ate. In this case, the latin name for iron is ferrum, and when writing the compound, ferrum is turned into ferrate after the suffix -ate is added.
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