QA

Question 1

Sodium hydroxide (no precipitate)

Answer 1

Ammonia (ammonium)

Question 2

Sodium hydroxide (precipitate)(soluble in excess)

Answer 2

Zinc (Zn2+)-white precipitate
Aluminium (al3+)-white precipitate
Lead(Pb2+)-white precipitate

Question 3

Sodium hydroxide (precipitate) (insoluble in excess)

Answer 3

Calcium(ca2+) -white precipitate, insoluble in excess NaOH

Question 4

Aqueous Ammonia (no precipitate)

Answer 4

Ammonium (NH4 )
Calcium (Ca2+)

Question 5

Aqueous Ammonia( white precipitate)

Answer 5

Aluminium (Al3+)-insoluble in excess
Lead(Pb2+)-insoluble in excess

Zinc(Zn2+)-Soluble in excess

Question 6

Aqueous Ammonia (coloured precipitate)

Answer 6

Fe2+ and Fe3+ (green and reddish-brown precipitate insoluble in excess)

Cu2+-light blue precipitate soluble in excess to give a dark blue solution