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The HCl converts any contaminated impurities to the corresponding chlorides, which are more volatile and easily vaporized. That way, they are vaporized more easily and quickly in that flame, allowing the cation to create the correct color flame without contamination.

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Why do chlorides burn different colors?

Chlorides burn different colors because the flame color produced is dependent on the specific metal cation present in the compound. Each metal cation emits a unique spectrum of colors when heated in a flame due to the excitation of electrons to higher energy levels and subsequent emission of light as the electrons return to their ground state. This property is utilized in flame tests to identify the presence of specific metal ions in a substance.


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