PHS Edexcel: Identifying Ions

Which metal ion is identified by a red flame test colour?

• Li⁺

• Na⁺

• K⁺

• Cu²⁺

Which metal ion is identified by a yellow flame test colour?

• Li⁺

• Na⁺

• K⁺

• Cu²⁺

Which metal ion is identified by a lilac flame test colour?

• Ca²⁺

• Na⁺

• K⁺

• Cu²⁺

Which metal ion is identified by a orange-red flame test colour?

• Ca²⁺

• Na⁺

• K⁺

• Cu²⁺

Which metal ion is identified by a blue-green flame test colour?

• Ca²⁺

• Na⁺

• Li⁺

• Cu²⁺

Which metal ion would produce a green precipitate when tested with sodium hydroxide?

• Fe²⁺

• Fe³⁺

• Cu²⁺

• Ca²⁺

• Al³⁺

Which metal ion would produce a brown precipitate when tested with sodium hydroxide?

• Fe²⁺

• Fe³⁺

• Cu²⁺

• Ca²⁺

• Al³⁺

Which metal ion would produce a blue precipitate when tested with sodium hydroxide?

• Fe²⁺

• Fe³⁺

• Cu²⁺

• Ca²⁺

• Al³⁺

Which metal ions would produce a white precipitate when tested with sodium hydroxide? (two answers)

• Fe²⁺

• Fe³⁺

• Cu²⁺

• Ca²⁺

• Al³⁺

How could you distinguish between aluminium and calcium ions, as both form white precipitates when tested with sodium hydroxide?

• The aluminium ions will form a colourless solution when excess sodium hydroxide is added

• The calcium ions will form a colourless solution when excess sodium hydroxide is added

• There is no way to tell the difference

• Solutions containing aluminium ions will have a distinctive smell