If the potassium nitrate solution contains a small amount of sodium chloride, it can be purified by evaporative crystallization 1. The remaining solution must be potassium nitrate solution 2. The remaining solution must be sodium chloride unsaturated solution 3. The above method can completely separate the two 4. Precipitated crystals contain only potassium nitrate If the potassium nitrate solution contains a small amount of sodium chloride, it can be purified by evaporative crystallization 1. The remaining solution must be potassium nitrate solution 2. The remaining solution must be sodium chloride unsaturated solution 3. The above method can completely separate the two. 4. Precipitated crystals contain only potassium nitrate

If the potassium nitrate solution contains a small amount of sodium chloride, it can be purified by evaporative crystallization 1. The remaining solution must be potassium nitrate solution 2. The remaining solution must be sodium chloride unsaturated solution 3. The above method can completely separate the two 4. Precipitated crystals contain only potassium nitrate If the potassium nitrate solution contains a small amount of sodium chloride, it can be purified by evaporative crystallization 1. The remaining solution must be potassium nitrate solution 2. The remaining solution must be sodium chloride unsaturated solution 3. The above method can completely separate the two. 4. Precipitated crystals contain only potassium nitrate

3 Is right.
Can be recrystallized several times to separate potassium nitrate solid, filtering.

Why should pure potassium nitrate be obtained in a mixture of potassium nitrate and sodium chloride by evaporating, concentrating and cooling the crystals? Why not filter out sodium chloride crystals while they are hot and evaporate? Excuse me first floor while hot filtration, not enough water sodium chloride should not dissolve? Is potassium nitrate insoluble in water? Part of it will dissolve, right? So why should pure potassium nitrate be obtained from a mixture of potassium nitrate and sodium chloride by evaporating and concentrating while filtering? Excuse me second floor why can think sodium chloride is still in solution and a large amount of potassium nitrate is on the filter paper?

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