Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Cu2+
Blue precipitate
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Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Fe2+
Green precipitate
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Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Mn2+
Brown precipitate
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Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Cr3+
Green precipitate
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Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Fe3+
Brown precipitate
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(Cu2+) Colour of precipitate formed when excess NH3 (aq) is added
Precipitate re-dissolves to give a blue solution
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(Fe2+) Colour of precipitate formed when excess NH3 (aq) is added
No change
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(Mn2+) Colour of precipitate formed when excess NH3 (aq) is added
No change
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(Cr3+) Colour of precipitate formed when excess NH3 (aq) is added
Precipitate dissolves to give a purple solution
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(Fe3+) Colour of precipitate formed when excess NH3 (aq) is added
No change
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(Cu2+) Colour of precipitate formed when excess OH- (aq) is added
No change
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(Fe2+) Colour of precipitate formed when excess OH- (aq) is added
No change
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(Mn2+) Colour of precipitate formed when excess OH- (aq) is added
No change
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(Cr3+) Colour of precipitate formed when excess OH- (aq) is added
Precipitate dissolves to give a green solution
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(Fe3+) Colour of precipitate formed when excess OH- (aq) is added
No change
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Copper (II) ion before addition
Blue solution
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Colour of the iron (II) ion before addition
Green solution
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Colour of the Manganese (II) ion before addition
Pink solution
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Colour of the Chromium (III) ion before addition
Violet solution
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Colour of the iron (III) ion before addition
Yellow/brown solution
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Equation of ammonium ion reacting with hydroxide ion.
NH4+(aq) + OH-(aq) -> NH3(aq) + H20(aq)
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Test for ammonium ion
Half fill a test tube with the solution to be analysed. Add NaOH solution and warm gently. If the gas produced turns damp red litmus paper blue, sample contained ammonium ions
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Other cards in this set
Card 2
Front
Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Fe2+
Back
Green precipitate
Card 3
Front
Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Mn2+
Back
Card 4
Front
Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Cr3+
Back
Card 5
Front
Colour of precipitate formed when NH3 (aq) or OH-(aq) is added to Fe3+
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