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describe a method you could use to obtain crystals of potassium nitrate from potassium nitrate solution

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Answer: evaporation

To separate crystal of potassium nitrate(solid) from potassium nitrate solution(liquid), you need a method that could separate solid material from the liquid. One of the method would be evaporation.
Evaporation is used to separate salt from seawater by evaporating the liquid. The evaporation could be induced by heating the solution pass the boiling point of the liquid substance.