IGNITION TEST. Heating a small sample in a spatula in a Bunsen flame can be suggestive. If the compound ▇▇▇▇▇ with a smoky flame, it is probably an aromatic compound. If a large ashy residue is left after is left after ignition, the unknown is probably a metal salt.
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Sources: Laboratory Safety and Experiment Guidelines, Laboratory Safety and Experiment Guidelines, Laboratory Safety and Experiment Guidelines