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On adding NaOH some cations form precipitates of a colour that is typical to them, while most others will produce a white precipitate.

Copper (II) forms a blue precipitate:

Silver forms a brown precipitate:

Iron (II) forms green precipitate:

Iron (III) forms orange precipitate:
Al3+ Zn2+ Pb2+ Mg2+ Ba2+ all form a white precipitate:
Sodium and Ammonium do not form precpiptates
Copyright © 2006, 2007 Craig Pilott