Q.

Sodium palmitate is a major constituent in soap. When an aqueous solution of sodium paimitate having 1 kg of solvent is analysed for its boiling point, following data is obtained.

MolesBoiling Point
0100° C 
0.02100.0372° C
0.04100.0744° C
0.05100.093° C 
0.06100.1° C
0.08 100.12° C

Identify the option(s) which is/are correct.

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a

Aqueous mixture of sodium palmitate having concentration equal to 0.07 M will be heterogeneous.

b

Osmotic pressure at 0.08 M  at 300 K will be 1.9704 atm.

c

At 0.4 M concentration, the solution is homogeneous.

d

The CMC value of sodium palmitate should be less than 0.06 M.

answer is A, B.

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Detailed Solution

ATb=Kbm

03.7202=Kb

Kb=1.86

ΔTb2=Kbm=0.04×1.86=0.0744

ΔTb3=1.86×0.05=0.093

ΔTb=1.86×0.06=0.1116

Hence, options A and B are correct.

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