Chemical analysis - Retrieval 2

When sodium hydroxide is added to a test solution, a blue precipitate is formed. Which metal ion is present?

• Fe²⁺

• Cu²⁺

• Ca²⁺

• Al³⁺

When sodium hydroxide is added to a test solution, a green precipitate is formed. Which metal ion is present?

• Fe²⁺

• Fe³⁺

• Cu²⁺

• Ca²⁺

What colour precipitate is formed when sodium hydroxide is added to a test solution containing Fe³⁺ ions?

• White

• Cream

• Brown

• Blue

What colour precipitate is formed when sodium hydroxide is added to a test solution containing Ca²⁺ ions?

• Brown

• White

• Cream

• Blue

Explain how, using sodium hydroxide solution, you could tell the difference between a solution containing aluminium ions and a solution containing magnesium ions.

Which of the following equations is balanced correctly?

• Ca²⁺ + 3OH^- → Ca(OH)₂

• Al³⁺ + 2OH^- → Al(OH)₂

• Mg²⁺ + 2OH^- → Ca(OH)₂

• Ca²⁺ + 2OH^- → Ca(OH)₂

Which 2 solutions are required to test a solution for halide ions (Cl^-, Br^- or I^-)

• Hydrochloric acid and silver nitrate

• Nitric acid and limewater

• Limewater and silver nitrate

• Nitric acid and silver nitrate

Which 2 solutions are required to test a solution for sulfate ions, SO₄^2- ?

• Hydrochloric acid and barium sulfate

• Sulfuric acid and limewater

• Hydrochloric acid and barium chloride

• Nitric acid and silver nitrate

A solution produces:

A blue precipitate when dilute sodium hydroxide is added and

a white precipitate when hydrochloric acid and barium chloride is added

What is the name of the solution being tested?

A solution produces:

A lilac flame when heated in a Bunsen flame and

a cream precipitate when nitric acid and silver nitrate is added

What is the name of the solution being tested?