CH-399
Separation and purification
Chemistry · Secondary 3 · Medium · Separation and purification
A mixture contains two solids, A and B. The table shows their solubility.
- A: soluble in water, insoluble in ethanol
- B: insoluble in water, soluble in ethanol
Which procedure will obtain a pure dry sample of B from the mixture?
- A: soluble in water, insoluble in ethanol
- B: insoluble in water, soluble in ethanol
Which procedure will obtain a pure dry sample of B from the mixture?
- Add ethanol, filter, then evaporate the filtrate.
- Add ethanol, filter and keep the residue.
- Add water, filter, then evaporate the filtrate.
- Add water, filter and keep the residue.
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