The characteristic colour of the flame shown when a copper salt moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner is
when a copper sail moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner, the characteristics colour of the flame is green. This is due to the presence of copper ions (Cu\(^{2+}\), which emit a green light when heated.
There is an explanation video available below.
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