O-LevelChemistryAtomic Structure5070/11 · Oct/Nov 2013 · Q41 Mark
The apparatus shown is used to distil a dilute solution of ethanol in water. [B.P.: ethanol, 78°C; water 100°C] Which graph shows the change in concentration of the ethanol in the boiling flask as the distillation proceeds?
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Agraph with concentration of ethanol on the y-axis and time on the x-axis, showing a curve that starts high, dips, then rises slightly above the starting point and flattens.
Bgraph with concentration of ethanol on the y-axis and time on the x-axis, showing a curve that starts at zero and steadily increases to a plateau.
Cgraph with concentration of ethanol on the y-axis and time on the x-axis, showing a curve that starts high and steadily decreases to a plateau.
Dgraph with concentration of ethanol on the y-axis and time on the x-axis, showing a curve that starts high, dips, then rises again.
✓ Correct answer
C: graph with concentration of ethanol on the y-axis and time on the x-axis, showing a curve that starts high and steadily decreases to a plateau.
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