CH-499
Separation and purification
Chemistry · Secondary 3 · Medium · Separation and purification
A student wants to separate a mixture of solid sodium chloride and solid copper filings to obtain both solids dry. Which sequence of steps is most suitable?
- Use a magnet, then evaporate the remaining solid.
- Dissolve the mixture in water, filter, then evaporate the filtrate to dryness.
- Heat the mixture strongly until sodium chloride melts, then pour it off.
- Sublime sodium chloride away from the copper.
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