Y11 FAQ1 Cation Tests
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9 Terms
1
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Lithium ion flame colour
Red
2
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Sodium ion flame colour
Yellow/orange
3
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Potassium ion flame colour
Lilac
4
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Copper (II) ion flame colour
Blue/green
5
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Calcium ion flame colour
Orange/red (brick red)
6
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Test for aqueous copper (II) ions
Add NaOH(aq), blue precipitate observed
7
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Test for aqueous iron (II) ions
Add NaOH(aq), green precipitate observed
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Test for aqueous iron (III) ions
Add NaOH(aq), brown precipitate observed
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Test for aqueous ammonium ions
Warm with NaOH(aq), test gas evolved with damp red litmus paper, which will turn blue
Note 
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