Question

Calculate the freezing point of a 0.100 m aqueous solution of k2so4, taking interionic attractions into consideration by using the van't hoff factor (i for 0.100 m k2so4 = 2.32).

Answer 1

Ionic salt dissociate completely in water particularly in water at low concentration.
The molal freezing point of depression constant for water is 1.85kg/k/mol
therefore depression of freezing point =1.853 x 0.100 x 2.32=0.429 degrees celsius
hence solute freeze at - 0.429 degree celsius