CH-1324
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A mixture contains only sodium chloride and sand. Which sequence of steps is the best method to obtain pure dry sodium chloride crystals?
- dissolution → filtration → evaporation to dryness
- dissolution → filtration → partial evaporation → crystallisation
- filtration → dissolution → evaporation to dryness
- filtration → evaporation to dryness → crystallisation
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