Revision on Flame Tests and Cations

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19 Terms

1
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Aluminium (Al³⁺) + NaOH

White ppt., soluble in excess → colourless solution

2
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Aluminium (Al³⁺) + NH₃

White ppt., insoluble in excess

3
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Ammonium (NH₄⁺) + NaOH

Ammonia produced on warming

4
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Calcium (Ca²⁺) + NaOH

White ppt., insoluble in excess

5
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Calcium (Ca²⁺) + NH₃

No ppt

6
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Chromium(III) (Cr³⁺) + NaOH

Green ppt soluble in excess

7
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Chromium(III) (Cr³⁺) + NH₃

Grey-green ppt., insoluble in excess

8
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Copper (Cu²⁺) + NaOH

Light blue ppt., insoluble in excess

9
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Copper (Cu²⁺) + NH₃

Light blue ppt., soluble → dark blue solution

10
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Iron(II) (Fe²⁺) + NaOH

Green ppt., insoluble in excess

11
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Iron(II) (Fe²⁺) + NH₃

Green ppt., insoluble in excess

12
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Iron(III) (Fe³⁺) + NaOH

Red-brown ppt., insoluble in excess

13
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Iron(III) (Fe³⁺) + NH₃

Red-brown ppt., insoluble in excess

14
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Zinc (Zn²⁺) + NaOH

White ppt., soluble in excess → colourless solution

15
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Zinc (Zn²⁺) + NH₃

White ppt., soluble in excess → colourless solution

16
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Flame Test for Lithium

Red Flame

17
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Flame Test for Sodium

Yellow Flame

18
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Flame Test for Pottasium

Lilac Flame

19
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Flame Test for Copper(II)

Blue-Green Flame