Ah, the flame tests and precipitate observations—one must be precise, as the mark scheme is strict. For cations, note the colours: sodium burns yellow, potassium lilac, calcium brick-red. For anions, chloride gives a white precipitate with silver nitrate, sulphate a white with barium chloride. I know this because my son's revision sheets are spread next to my atlas, and we test each other—he on his chemistry, me on the capitals of the world. The *shken* taps the tin roof, and we share a pot of *ja*, two students in our own ways.
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