CH-1391
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A student wants to separate a mixture of sand and sodium chloride using their different solubilities in water.
Which sequence of processes will give a pure dry sample of sodium chloride?
1. Filter the mixture
2. Add water and stir
3. Evaporate the solution to dryness
4. Filter and wash the residue
Which sequence of processes will give a pure dry sample of sodium chloride?
1. Filter the mixture
2. Add water and stir
3. Evaporate the solution to dryness
4. Filter and wash the residue
- 2, 4, 3
- 1, 2, 3
- 4, 2, 3
- 2, 3, 4
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