CH-1326
Separation and purification
Chemistry · Secondary 4 · Medium · Separation and purification
A mixture contains three solids X, Y and Z.
Their solubilities are:
- X: soluble in water, insoluble in ethanol
- Y: insoluble in water, soluble in ethanol
- Z: insoluble in both water and ethanol
Which sequence of steps will obtain pure X from the mixture?
1 add water 2 filter 3 add ethanol to residue 4 evaporate filtrate to dryness
Their solubilities are:
- X: soluble in water, insoluble in ethanol
- Y: insoluble in water, soluble in ethanol
- Z: insoluble in both water and ethanol
Which sequence of steps will obtain pure X 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, 2, 4
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