CH-1384
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A mixture of three solids A, B and C has the following solubilities.
- A: soluble in water, insoluble in ethanol
- B: insoluble in water, soluble in ethanol
- C: insoluble in both water and ethanol
Which sequence of steps will obtain pure solid A from the mixture?
1 add water
2 filter
3 add ethanol to residue
4 evaporate filtrate to dryness
- A: soluble in water, insoluble in ethanol
- B: insoluble in water, soluble in ethanol
- C: insoluble in both water and ethanol
Which sequence of steps will obtain pure solid A from the mixture?
1 add water
2 filter
3 add ethanol to residue
4 evaporate filtrate to dryness
- 1, 2, 4
- 2, 1, 4
- 3, 2, 4
- 1, 3, 4
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