The student makes a solution of potassium nitrate by neutralising aqueous potassium hydroxide with dilute nitric acid. Describe how he could use crystallisation to obtain a pure, dry sample of potassium nitrate crystals from the solution of potassium nitrate.

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1. The student makes a solution of potassium nitrate by neutralising aqueous potassium hydroxide with dilute nitric acid. Describe how he could use crystallisation to obtain a pure, dry sample of potassium nitrate crystals from the solution of potassium nitrate.