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Why do we call Ba(NO3)2 barium nitrate, but we call Fe(NO3)2 iron(II) nitrate?
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Why do we call Ba(NO3)2 barium nitrate, but we call Fe(NO3)2 iron(II) nitrate?

User Batia
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Because usually when Ba forms ion it will form Ba2+. But when Fe forms ion, it can form Fe2+ or Fe3+. So you need to distinguish them by add their valence at the name.
User Maxim Zhukov
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