Flow Diagram Summarising Tests For Positive Ions (Cations)

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Flow Diagram Summarising Tests for Positive Ions (Cations)
Dissolve a small amount of solid in water
Add sodium hydroxide solution
Is there a precipitate formed?
NO
Yes
Warm test tube.
Does damp red litmus
NO
paper turn blue on
warming?
Green
Red/Brown
Blue
Precipitate
Precipitate
precipitate
Yes
2+
3+
2+
Fe
Fe
Cu
+
NH
4
Iron (II)
Iron (III)
Copper
Ammonium
(II)
Group I or II metal ion
+
Red
Brick –red
Li
Flame
Flame
Lithium
Flame test
2+
Yellow
Lilac
Ca
Flame
Flame
Calcium
+
+
Na
K
Sodium
Potassium

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