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O Level Chemistry Chp 11: Qualitative Analysis

hperm Note: Write Precipitate as PPT e.g. No Precipitate -> No PPT e.g. White Precipitate -> White PPT e.g. Red-Brown Precipitate -> Red-Brown PPT
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ihperm
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Last updated: June 1, 2026
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First submittedJune 1, 2026
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Cation Tests - Dropwise NaOH (aq)
Type 1
Answer
Cation Tests - Dropwise NaOH (aq)
Type 1
1
Ammonium
No PPT
Sodium
No PPT
Potassium
No PPT
Zinc
White PPT
Aluminium
White PPT
Lead (II)
White PPT
Calcium
White PPT
Copper (II)
Light Blue PPT
Iron (II)
Green PPT
Iron (III)
Red-Brown PPT
Cation Tests - Excess NaOH (aq)
Type 2
2
Zinc
Colourless Solution
Aluminium
Colourless Solution
Lead (II)
Colourless Solution
Calcium
White PPT
Copper (II)
Light Blue PPT
Iron (II)
Green PPT
Iron (III)
Red-Brown PPT
Cation Tests - Dropwise NH3 (aq)
Type 3
3
Zinc
White PPT
Aluminium
White PPT
Lead (II)
White PPT
Calcium
No PPT
Copper (II)
Light Blue PPT
Iron (II)
Green PPT
Iron (III)
Red-Brown PPT
Cation Tests -- Excess NH3 (aq)
Type 4
4
Hint
Answer
Zinc
Colourless Solution
Aluminium
White PPT
Lead (II)
White PPT
Calcium
No PPT
Copper (II)
Dark Blue PPT
Iron (II)
Green PPT
Iron (III)
Red-Brown PPT
Copper Compounds Colour
Type 5
5
CuO
Black
Cu(OH)2
Light Blue
CuCO3
Green
Cu(NO3)2
Blue
CuSO4
Blue
Anion Tests
Type 6
Note: Type ion name in full
6
Add aqueous sodium hydroxide, add aluminium foil, and then warm gently
Nitrate
Add dilute acid
Carbonate
Acidify with dilute nitric acid, add silver nitrate -- White PPT
Chloride
Acidify with dilute nitric acid, add silver nitrate -- Yellow PPT
Iodine
Acidify with dilute nitric acid, add barium nitrate
Sulfate
Gas Tests and Miscellaneous Tests
Type 7
7
Place moist red litmus paper at the mouth of the test tube, turns blue
Ammonia
Place moist blue litmus paper at the mouth of the test tube, turns red initially then is bleached
Chloride
Add potassium manganate (VII) in dropwise to filter paper, then purple potassium manganate (VII) being decolourised is observed
Sulfur Dioxide
Bubble the gas into limewater
Carbon Dioxide
Place a lighted splint at the mouth of the test tube
Hydrogen
Place a glowing splint at the mouth of the test tube
Oxygen
Add anhydrous copper (II) sulfate OR add cobalt (II) chloride paper
Water
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