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Iron III carbonate, Fe2(CO3)3

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From Pisgahchemist: You might think that Fe3+ and CO3^2- ions might combine to make insoluble Fe2(CO3)3, but you would be wrong. Fe2(CO3)3 does not exist. It turns out that solutions of metal ions with higher oxidation states tend to be more acidic. Iron in the +3 oxidation state is too acidic to form the carbonate. You get CO2 gas instead.

Therefore, you can have FeCO3, which is iron(II) carbonate, but there can be no no Fe2(CO3)3.

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11y ago

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