CH-366
Separation and purification
Chemistry · Secondary 3 · Easy · Separation and purification
A student wants to separate a mixture of sand and sodium chloride to obtain pure, dry sodium chloride. Which sequence of methods should be used?
- Add water, filter to remove sand, then evaporate the filtrate to dryness.
- Add water, evaporate to dryness, then filter off the sand.
- Heat the mixture strongly to melt the sodium chloride and pour it off.
- Use chromatography to separate the sand from sodium chloride.
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