CH-1378
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A mixture contains three solids A, B and C.
• A is soluble in water but insoluble in ethanol.
• B is insoluble in water but soluble in ethanol.
• C is insoluble in both water and ethanol.
Which sequence of steps would obtain pure A from the mixture?
1 add water
2 filter
3 add ethanol to the residue
4 evaporate the filtrate to dryness
• A is soluble in water but insoluble in ethanol.
• B is insoluble in water but soluble in ethanol.
• C is insoluble in both water and ethanol.
Which sequence of steps would obtain pure A from the mixture?
1 add water
2 filter
3 add ethanol to the residue
4 evaporate the filtrate to dryness
- 1, 2, 4
- 3, 2, 4
- 2, 1, 4
- 1, 3, 2
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