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Question
5 g of urea is dissolved in one kg of water. Up to what temperature, the solution may be cooled before ice starts crystallizing out? (Kf of water = 1.86)
Options
A.−0.310°C
B.−0.240°C
C.−0.195°C
D.−0.155°C
Solution
$\Delta T_{f} = K_{f}.m = 1.86 \times \frac{5/60}{1} = 0.155^{0}C$
∴ F.P. = – 0.155° C
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