Testing for ions and gases
Chemists are often asked to test a sample of a substance to find out if it contains specific ions or compounds. There are a variety of techniques used to do this.
Testing for ions – flame tests
It is possible to use a flame test to detect the presence of an alkali metal ion.
Flame colours and the metal ion they represent
|Flame colour||Ion present|
|Brick red||Calcium, Ca2+|
|Apple green||Barium, Ba2+|