CH-1388
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A student wants to obtain dry crystals of sodium chloride from its aqueous solution. Which sequence of steps should be used?
- Heat to concentrate, cool to crystallise, filter, then dry crystals.
- Filter solution, then heat filtrate to dryness immediately.
- Cool solution first, then heat crystals strongly to dryness.
- Dry solution in an oven without heating beforehand.
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