Concentrated aqueous sodium hydroxide can separate a mixture of

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Concentrated aqueous sodium hydroxide can separate a mixture of $A l^{3 +}$ and $F e^{3 +}$

$A l^{3 +}$ forms white gelatinous precipitate of $A l {(O H)}_{3}$ , which is soluble in excess of NaOH.

$A l {(O H)}_{3} + N a O H \to N a A l O_{2} + 2 H_{2} O$

$F e^{3 +}$ forms reddish brown precipitate of $F e {(O H)}_{3}$ , which is insoluble in excess of NaOH.

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