CH-1322
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A mixture contains solid potassium nitrate and sand. Which sequence of steps is the best method to obtain pure dry crystals of potassium nitrate?
- Dissolution → filtration → evaporation → crystallisation
- Filtration → dissolution → evaporation → crystallisation
- Evaporation → crystallisation → dissolution → filtration
- Dissolution → evaporation → filtration → crystallisation
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