Clean platinum or nichrome wireis dipped into concentrated hydrochloric acid, then into the solid to be tested and finally into the hottest part of the Bunsen flame.
The concentrated hydrochloric acid convert some of the unknown solid into chlorides.
Chlorides are more volatile than other salts, so some of the unknown goes into gas phase when heated in the hot flame.
Colours of the flame test are produced through the excitation of electrons to higher energy levels, they become unstable and falls to the ground state. Through the process of falling it emits light of colour specific to the metal present in the compound.
- The flame test is the only test for group 1
- Flame test cannot be used on mixtures as the colour produced by one of the ions will mask the colour produced by the other metal ions.
Li+ (crimson) , Na+ (Yellow), K+ (Lilac), Ca 2+ (Yellow-red), Sr 2+ (Red), Ba 2+ (pale green)
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