Identifying Cations

Question 0

Identify Aluminum (Al3+) in Sodium Hydroxide Solution (NaOH) on adding a few drops and on adding excess.

Answer 0

White precipitate that is soluble in excess

Question 1

Identify Zinc(Zn2+) in Sodium Hydroxide Solution (NaOH) on adding a few drops and on adding excess.

Answer 1

White precipitate that is soluble in excess

Question 2

Identify Lead(II) (Pb2+) in Sodium Hydroxide Solution (NaOH) on adding a few drops and on adding excess.

Answer 2

White precipitate that is soluble in excess

Question 3

Identify Calcium (Ca2+) in Sodium Hydroxide Solution (NaOH) on adding a few drops and on adding excess.

Answer 3

White precipitate that is insoluble in excess

Question 4

Identify Copper(II) (Cu2+) in Sodium Hydroxide Solution (NaOH) on adding a few drops and on adding excess.

Answer 4

Light Blue precipitate that is insoluble in excess

Question 5

Identify Iron(II) (Fe2+) in Sodium Hydroxide Solution (NaOH) on adding a few drops and on adding excess.

Answer 5

Green precipitate that is insoluble in excess

Question 6

Identify Iron(III) (Fe3+) in Sodium Hydroxide Solution (NaOH) on adding a few drops and on adding excess.

Answer 6

Reddish-brown precipitate that is insoluble in excess

Question 7

Identify Ammonium (NH4+) in Sodium Hydroxide Solution (NaOH) on adding a few drops and on adding excess.

Answer 7

No precipitate.
On heating, Ammonia gas is given off.
Ammonia gas turns moist red litmus paper blue.

Question 8

Identify Zinc (Zn2+) in Aqueous ammonia (NH3) on adding a few drops and on adding excess.

Answer 8

White precipitate that is soluble in excess

Question 9

Identify Aluminum(Al3+) in Aqueous ammonia (NH3) on adding a few drops and on adding excess.

Answer 9

White precipitate that is insoluble in excess

Question 10

Identify Lead(II) (Pb2+) in Aqueous ammonia (NH3) on adding a few drops and on adding excess.

Answer 10

White precipitate that is insoluble in excess

Question 11

Identify Calcium(Ca2+) in Aqueous ammonia (NH3) on adding a few drops and on adding excess.

Answer 11

No precipitate

Question 12

Identify Copper(II) (Cu2+) in Aqueous ammonia (NH3) on adding a few drops and on adding excess.

Answer 12

Light blue precipitate that is soluble in excess(forming a deep blue solution)

Question 13

Identify Iron(III) (Fe3+) in Aqueous ammonia (NH3) on adding a few drops and on adding excess.

Answer 13

Reddish-brown precipitate that is insoluble in excess

Question 14

Identify Iron(II) (Fe2+) in Aqueous ammonia (NH3) on adding a few drops and on adding excess.

Answer 14

Green precipitate that is insoluble in excess