In a proper lab, they'd use sublimation for ammonium chloride, filtration for sand, and evaporation for salt. But in my village school with just a stove and some pans? We heat the mixture gently in an old steel plate—the ammonium chloride collects on a cooler tile placed above. Then we wash the leftover mix with water to remove the salt, and the sand remains. I’ve done this on my chulha when the power’s out, using a slate from the classroom roof as the cooler surface.
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