9-1 Chemistry/Identification of ions
Flame tests can be used to identify some cations (positive ions).
|Compound||colour of flame||Photo|
If a sample containing a mixture of ions is used, some flame colours can be masked.
Sodium hydroxide solution can be used to identify some cations:
Ions form white precipitates when sodium hydroxide solution is added but only the aluminium hydroxide precipitate dissolves in excess sodium hydroxide solution.