Cations (Zn(II), Al(III), Cu(II), Fe(II) and Fe(III): Tested with NaOH.

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Sodium hydroxide is added slowly and then in excess to solutions of these salts.
The zinc (II) and Aluminium (III) form white gelatinous hydroxide precipitates that redissolve. Copper (II) forms a light blue hydroxide that does not disssolve. Iron (II) and (III), respectively, form green and brown hydroxides that do not redissolve.

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