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Identification of common cations (Adding aqueous NaOH (NH3 gas evolved on…
Identification of common cations
Adding aqueous NaOH
NH3 gas evolved on warming
NH4+
White precipitate insoluble in excess aqueous NaOH
Ca+
White precipitate dissolves in excess aqueous NaOH to form a colourless solution
Zn+2, Al+3, Pb+2
Light blue precipitate insoluble in excess aqueous NaOH
Cu+2
Green precipitate insoluble in excess aqueous NaOH
Fe+2
Reddish-brown precipitate insoluble in aqueous NaOH
Fe+3
Adding Aqueous NH3
No Precipitate formed
Ca+2
White precipitate dissolves in aqueous NH3 to form a colourless solution
Zn+2
White precipitate insoluble in aqueous NH3
Al+3, Pb+2
Light blue precipitate dissolves in excess aqueous NH3 to form a deep blue solution
Cu+2
Green precipitate insoluble in excess aqueous NH3
Fe+2
Reddish-brown precipitate insoluble in excess aqueous NH3
Fe+3