Concentrated aqueous sodium hydroxide can sep | vedclass

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(B) Concentrated aqueous $NaOH$ is a strong base that reacts with amphoteric metal ions to form soluble complexes or salts,while it does not react wit

Vedclass · Accepted Answer

$Al^{3+}$ and $Fe^{3+}$

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(B) Concentrated aqueous $NaOH$ is a strong base that reacts with amphoteric metal ions to form soluble complexes or salts,while it does not react with non-amphoteric metal ions like $Fe^{3+}$,which precipitate as hydroxides.$Al^{3+}$ is amphoteric and reacts with $NaOH$ to form soluble sodium meta-aluminate ($NaAlO_2$ or $Na[Al(OH)_4]$).$Fe^{3+}$ is not amphoteric and forms an insoluble brown precipitate of ferric hydroxide $(Fe(OH)_3)$ in the presence of $NaOH$.Therefore,$NaOH$ can be used to separate $Al^{3+}$ from $Fe^{3+}$.

Concentrated aqueous sodium hydroxide can separate a mixture of

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