Suppose that you have 1.0 kg of water to which you add 0.5 mol sucrose. How will the freezing point of the water change?

Sucrose dissolves in water but does not evaporate or freeze out with the water. Dissolved particles lower the water’s freezing point, a colligative effect. Here, 0.5 mol sucrose in 1.0 kg of water gives a concentration of 0.5 mol/kg, so the freezing point will decrease rather than increase.

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