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Chemistry · L4 · Testing whether a metal hydroxide is amphoteric

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Decision flow for distinguishing an amphoteric transition-metal hydroxide (dissolves in both excess acid and excess base) from a purely basic one (dissolves in acid only).

by @openstemUpdated Chemistry
Precipitate M(OH)ₙ(s)formed with a little NaOH(aq)Add EXCESSstrong acid to a sampleAdd EXCESSstrong base to a sampleDoes itredissolve?Does itredissolve?Hydroxide hasbasic characterHydroxide hasacidic characterNot base-solubleNot acid-solubleBoth acid- ANDbase-soluble?AMPHOTERIC(e.g. Cr(OH)₃, Zn(OH)₂)Simple basic hydroxide(e.g. Fe(OH)₃, Ni(OH)₂)YesYesNoNoYesNo — only one side dissolves

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