Cation tests Aqueous Sodium Hydroxide - NaOH
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Copper (II) (Cu²⁺) + Aqueous sodium hydroxide (NaOH)
Light blue precipitate (insoluble in excess NaOH)
Iron (II) (Fe²⁺) + Aqueous sodium hydroxide (NaOH)
Green precipitate (insoluble in excess NaOH, oxidises to turn brown in 5 minutes in air)
Iron (III) (Fe³⁺) + Aqueous sodium hydroxide (NaOH)
Brown precipitate (insoluble in excess NaOH)
Aluminium (Al³⁺) + Aqueous sodium hydroxide (NaOH)
White precipitate (soluble in excess NaOH, forming a colourless solution)
Zinc (Zn²⁺) + Aqueous sodium hydroxide (NaOH)
White precipitate (soluble in excess NaOH, forming a colorless solution)
Calcium (Ca²⁺) + Aqueous sodium hydroxide (NaOH)
White precipitate (insoluble in excess NaOH)
Ammonium (NH₄⁺) + Aqueous sodium hydroxide (NaOH)
No precipitate, but ammonia gas is released on heating (turns damp red litmus paper blue)
Chromium (III) (Cr³⁺) + Aqueous sodium hydroxide (NaOH)
Green precipitate (soluble in excess NaOH, forming a dark green solution)
Note 
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