Qualitative analysis : Test for cations (positive)

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Chemistry

IGCSE Chemistry

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8 Terms

1
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Aluminium

Aqueous sodium hydroxide: white ppt., soluble in excess giving a colourless solution

Aqueous ammonia: white ppt. insoluble in excess

2
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Ammonium

Aqueous sodium hydroxide: ammonia produced on warming

Aqueous ammonia: no change

3
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Calcium

Aqueous sodium hydroxide: white ppt., insoluble in excess

Aqueous ammonia: no ppt., or very slight white ppt.

4
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Chromium (III)

Aqueous sodium hydroxide: Green ppt., soluble in excess

Aqueous ammonia: grey-green ppt., insoluble in excess

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Copper

Aqueous sodium hydroxide: light blue ppt., insoluble in excess

Aqueous ammonia: light blue ppt. soluble in excess, giving a dark blue solution

6
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Iron (II)

Aqueous sodium hydroxide: green ppt., insoluble in excess

Aqueous ammonia: green ppt., insoluble in excess

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Iron (III)

Aqueous sodium hydroxide: red-brown ppt., insoluble in excess

Aqueous ammonia: red-brown ppt., insoluble in excess

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Zinc

Aqueous sodium hydroxide: white ppt., soluble in excess giving a colourless solution

Aqueous ammonia: white ppt., soluble in excess, giving a colourless solution