CH-1354
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A damp mixture of sand and sodium chloride is given. Sodium chloride is soluble in water; sand is not.
Which sequence of methods will obtain dry, pure sodium chloride crystals?
Which sequence of methods will obtain dry, pure sodium chloride crystals?
- Add water, filter, evaporate the filtrate to dryness
- Add water, filter, crystallise the filtrate, then dry the crystals
- Filter the dry mixture, then crystallise the residue
- Use simple distillation on the dry mixture only
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