CH-1345
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A mixture contains three solids P, Q and R.
Their solubilities are:
- P: soluble in water, insoluble in ethanol
- Q: insoluble in water, soluble in ethanol
- R: insoluble in both water and ethanol
Which is the correct order of steps to obtain pure P?
1 filter
2 evaporate filtrate to dryness
3 add water
4 add ethanol
Their solubilities are:
- P: soluble in water, insoluble in ethanol
- Q: insoluble in water, soluble in ethanol
- R: insoluble in both water and ethanol
Which is the correct order of steps to obtain pure P?
1 filter
2 evaporate filtrate to dryness
3 add water
4 add ethanol
- 4, 1, 2
- 3, 1, 2
- 3, 2, 4
- 4, 1, 3
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