KS5 Tests for Ions

Question 1

Ammonium ions(NH₄⁺)

Answer 1

warm with sodium hydroxide solution
the gas produced turns damp litmus paper blue

Question 2

Magnesium ions ( Mg²⁺)

Answer 2

Add sodium hydroxide solution, white precipitate. Precipitate does not dissolve in excess NaOH.

Question 3

Calcium ions (Ca²⁺)

Answer 3

flame test orange- red flame

Question 4

Barium ions (Ba²⁺)

Answer 4

flame test green flame

Question 5

Strontium (Sr²⁺)

Answer 5

flame test red flame

Question 6

Aluminium (Al³⁺)

Answer 6

Add sodium hydroxide solution, white precipitate. Precipitate dissolves in excess NaOH(aq).

Question 7

Chloride (Cl^-)

Answer 7

Add few drops of nitric acid and silver nitrate solution, white precipitate which dissolves in dilute aqueous ammonia.

Question 8

Bromide (Br^-)

Answer 8

Add few drops of nitric acid and silver nitrate solution, cream precipitate which dissolves in concentrated aqueous ammonia.

Question 9

Iodide (I^-)

Answer 9

Add few drops of nitric acid and silver nitrate solution, yellow precipitate which is insoluble in concentrated aqueous ammonia.

Question 10

Sulfate (SO₄^2-)

Answer 10

Add few drops of hydrochloric acid and barium chloride solution, white precipitate.

Question 11

Hydroxide (OH^-)

Answer 11

warm with solid ammonium salt, the gas produced turns litmus paper blue.

Question 12

Carbonate (CO₃^2-)

Answer 12

add dilute hydrochloric acid, test the gas produced with limewater. Bubbles , the gas turns limewater milky.