Discussion
Which of the following aqueous non-electrolyte solution will produce the highest freezing point if 20g of the solute is dissolved in 1000g of water?
Answer: A
The highest freezing point is given by sucrose.
Freezing-point depression is a colligative property: ΔTf = Kf × molality, so it depends on the number of solute particles, not their kind. For the same 20 g in 1000 g of water, the solute with the largest molar mass gives the fewest moles, the smallest depression and so the highest freezing point.
Sucrose has the largest molar mass of the five, 342 g mol-1, against glucose 180, glycerol 92, ethanol 46 and methanol 32. Methanol, with the smallest molar mass, would give the lowest freezing point.
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