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Slide 2

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Add sodium hydroxide, if coloured
precipitate:
fe2+: green precipitate
fe3+: brown/red precipitate
cu2+: blue precipitate…read more

Slide 3

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Add sodium hydroxide, if white precipitate:
ca2+: distinguish from flame test (brick red)
Al3+: dissolves in excess sodium hydroxide solution
goes to colourless solution.
Mg2+: white precipitate…read more

Slide 4

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Add sodium hydroxide:
Ammonia gas is formed= NH4
Can be recognised by smell or by using
damp red litmus paper and it turns blue.…read more

Slide 5

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Test for carbon dioxide= turns lime water
milky
Test for water= anhydrous colbat chloride
paper turns from blue to pink.…read more

Slide 6

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Sulphate ion test (SO4 2-)
Add hydrochloric acid and then barium
chloride.
A white precipitate of barium sulphate means
the original compound was a sulphate.…read more

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