CH-486
Separation and purification
Chemistry · Secondary 3 · Medium · Separation and purification
A student wants to obtain dry samples of copper(II) sulfate crystals and excess magnesium from a mixture of solid copper(II) sulfate and magnesium. Which sequence of methods should be used?
- Add water, filter, evaporate the filtrate to dryness.
- Add water, evaporate the mixture to dryness, filter.
- Heat the mixture strongly, then cool and filter.
- Use a magnet, then evaporate the remaining solid to dryness.
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