IGCSE Chemistry: Testing for cations
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19 Terms
1
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Aluminium (Al3+) Test: Add aqueous sodium hydroxide.
white ppt., soluble in excess giving a colourless solution
2
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Aluminium (Al3+) test - Effect of Aqueous Ammonia
White precipitate, insoluble in excess
3
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ammonium (NH4+) - effect of aqueous sodium hydroxide
ammonia produced on warming
4
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Calcium (Ca2+) - effect of aqueous sodium hydroxide
white ppt., insoluble in excess
5
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calcium (Ca2+) - effect of aqueous ammonia
no ppt., or very slight white ppt.
6
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chromium (III) (Cr3+) - effect of aqueous sodium hydroxide
green ppt., soluble in excess
7
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chromium (III) (Cr3+) - effect of aqueous ammonia
grey-green ppt., insoluble in excess
8
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copper (Cu2+) - effect of aqeuous sodium hydroxide
light blue ppt., insoluble in excess
9
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copper (Cu2+) - effect of aqeuous ammonia
light blue ppt., soluble in excess, giving dark blue solution
10
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iron (II) (Fe2+) - effect of aqueous sodium hydroxide
green ppt., insoluble in excess
11
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iron (II) (Fe2+) - effect of aqueous ammonia
green ppt., insoluble in excess
12
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iron (III) (Fe3+) - effect of aqueous sodium hydroxide
red-brown ppt., insoluble in excess
13
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iron (III) (Fe3+) - effect of aqueous ammonia
red-brown ppt., insoluble in excess
14
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Zinc (Zn2+) test - Effect of Aqueous Sodium Hydroxide
white ppt., soluble in excess, giving a colourless solution
15
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Zinc (Zn2+) (aqueous ammonia)
white ppt., soluble in excess, giving a colourless solution
16
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Lithium (Li+) flame test
red
17
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Sodium (Na+) flame test
yellow
18
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Potassium (K+) flame test
lilac
19
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Copper (II), Cu2+ flame colour
blue-green