Which of the following solutes results in the greatest decrease in the freezing point of water...
Which of the following solutes results in the greatest decrease in the freezing point of water per mole of solute? Why? All are soluble in water.
a. FeSO3
b. KOH
c. Caffeine
d. CaBr2
Homework Answers
The decrease in freezing point 
is directly proportional to the vant Hoff factor 
The vant Hoff factor
depends on the number of particles obtained by dissociation of one
solute molecule.
The solute which gives maximum number of ions on dissociation, will have maximum value for vant Hoff factor and hence greatest decrease in freezing point.
| Solute | Number of ions obtained by dissociation of one solute molecule | Dissociation equation |
 |
2 |  |
 |
2 |  |
| Caffeine | 0 | No dissociation as it is non electrolyte |
 |
3 |  |
gives maximum number 
of ions on dissociation. Hence,
will have maximum value for vant Hoff factor and hence greatest
decrease in freezing
point.
Hence, option d.
is the answer.
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