Testing for Simple Ions GCSE Edexcel

What is observed when dilute acid is added dropwise to a carbonate ion (CO₃ ^2-)?

• Effervescence. Carbon dioxide gas is produced which can be identified with limewater.

• A white precipitate forms immediately.

• A pungent smell of ammonia is released.

• The solution turns blue.

Which test is used to identify sulphate ions (SO₄ ^2-)?

• Addition of dilute hydrochloric acid then dropwise addition of barium chloride solution, BaCl₂ (aq).

• Addition of silver nitrate solution, AgNO₃ (aq), followed by dilute nitric acid.

• Addition of sodium hydroxide solution, NaOH (aq), then warming gently.

• Addition of dilute hydrochloric acid followed by magnesium ribbon.

Which ion gives a white precipitate of silver chloride when tested with silver nitrate solution after adding dilute nitric acid?

• Chloride ion (Cl ^-)

• Sulfate ion (SO₄ ^2-)

• Nitrate ion (NO₃ ^-)

• Carbonate ion (CO₃ ^2-)

What is the colour of the precipitate formed when bromide ions (Br ^-) are tested with silver nitrate solution after adding dilute nitric acid?

• Cream precipitate of silver bromide.

• White precipitate of silver chloride.

• Yellow precipitate of silver iodide.

• No precipitate is formed.

What is the colour of the precipitate formed when iodide ions (I ^-) are tested with silver nitrate solution after adding dilute nitric acid?

• Yellow precipitate of silver iodide.

• White precipitate of silver chloride.

• Cream precipitate of silver bromide.

• No precipitate is formed.

What is the colour of the flame observed in a flame test for potassium ions (K⁺)?

• Lilac flame.

• Yellow flame.

• Green flame.

• Blue flame.

What is the colour of the flame observed in a flame test for sodium ions (Na⁺)?

• Bright yellow flame.

• Brick red flame.

• Apple green flame.

• Violet flame.

What is the colour of the flame observed in a flame test for lithium ions (Li⁺)?

• Bright red flame.

• Green flame.

• Blue flame.

• Yellow flame.

What is the colour of the flame observed in a flame test for calcium ions (Ca²⁺)?

• Orange red flame.

• Green flame.

• Blue flame.

• Violet flame.

What is observed when dilute sodium hydroxide solution is added dropwise to iron (II) ions (Fe²⁺) ?

• A green precipitate of is seen, which is insoluble in excess NaOH (aq).

• A blue precipitate is seen, which dissolves in excess NaOH to form a deep blue solution.

• A white precipitate is seen, which dissolves in excess NaOH to form a colourless solution.

• A brown precipitate is seen, which is insoluble in excess NaOH (aq).