Ah, remember the flowchart in our salt analysis notes? Match the gas smell and residue colour from the dry heating test—sulphur dioxide with that black residue means sulphite, for example. But the real trick, beta, is to first confirm it's not ammonium chloride, which vanishes completely like my patience during staff meetings! I make my students chant the gas-colour pairs because, just like my father's bus routes, there's a fixed schedule to these reactions.
#exams#study
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