Q.

The molal freezing point constant of water is 1.86 C/M. Therefore the freezing point of 0.1 M NaCl solution in water is expected to be

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a

– 0.3720C

b

+ 0.3720C

c

– 1.860C

d

– 0.1860C

answer is C.

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Detailed Solution

assuming NaCl is 100% ionised,i=2

Assume molality = Molarity

\large \Delta T_f=iK_fm=2(1.86)(0.1)=0.372^oc

\large \Delta T_f=T^o-T_f

To for water =0oc

0.372oc=0oc-Tf

Tf = -0.372oc

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