Cations

Question 1

Ammonium (NH4 +) effect of aqueous sodium hydroxide and aqueous ammonia

Answer 1

Aqueous sodium hydroxide: ammonia produced on warming

Aqueous ammonia: nothing

Question 2

What happens to calcium (Ca 2+) when aqueous sodium hydroxide and aqueous ammonia is added?

Answer 2

Aqueous Sodium Hydroxide: white ppt., insoluble in excess

Aqueous Ammonia: no ppt. or very slight white ppt.

Question 3

Copper [ll] (Cu 2+) effect of aqueous sodium hydroxide and aqueous ammonia

Answer 3

Aqueous Sodium hydroxide: heated, light blue ppt., insoluble in excess

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

Question 4

Iron [ll] (Fe 2+) effect of aqueous sodium hydroxide and aqueous ammonia

Answer 4

Aqueous Sodium hydroxide: green ppt., insoluble in excess

Aqueous Ammonia: green ppt., insoluble in excess

Question 5

Iron [lll] (Fe 3+) effect of aqueous sodium hydroxide and aqueous ammonia

Answer 5

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

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

Question 6

Zinc [ll] (Zn 2+) effect of aqueous sodium hydroxide and aqueous ammonia

Answer 6

Aqueous Sodium hydroxide: white ppt., soluble in excess, giving a colorless solution

Aqueous Ammonia: white ppt., soluble in excess, giving a colorless solution