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the initial metal-aqua ions always have H2O only as their ligands, and the charge is that of the ion.
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the precipitate formed by NON-EXCESS NaOH (or NH3) has no charge, and has the same number of OH ligands as the charge on the transition metal ion
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Chromium and Zinc are the only to react with EXCESS OH. They are also the only that show amphoteric behavior. The number of OH ligands is enough to make the initial metal-aqua ion charge the negative version, with the same magnitude. ([Cr(H2O)6]3+ -----> [Cr(OH)6]3-, [Zn(H2O)6]2+ -----> [Zn(OH)4]2-)
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