Question

Find out freezing point of 20% w/w glucose solution if k1 of water is 1.86 k kg mol-1

Answer 1

Answer:

Explanation:

The osmotic pressure is given by Π=CRT  

30=C×0.08206×298  

C=1.23 M

Assuming the density of the solution to be 1 g/ml, we can approximate molarity and molality.  

C=1.23 m  

The depression in the freezing point =ΔT  f  =$k_{f$  m=1.86×1.23=2.28 C

The freezing point of pure water is 0  C.  

The freezing point of solution =0−2.28=−2.28  C

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