Answer :

Kf = 1.86 K kg/mol

Mass of solute = 1.9g


Mass of solvent = 50g


Hence, Molality of the solution,


MgCl2 undergoes complete ionization and yields 3 moles of constituent ions for every mole of MgCl2. Therefore i=3


Depression in freezing point, ΔTf = iKfm


= 3 x 1.86 x 0.4


= 2.232 K


Tf = 273.15 – 2.232 = 270.918 K


B. (i) The boiling point of a solution depends on the number of particles of the solute. The amount of solute is higher in 2M glucose solution as compared to 1M glucose solution and therefore 2M glucose solution has a higher boiling point than 1M glucose solution.


(ii) When the external pressure applied becomes more than the osmotic pressure of the solution, the process of reverse osmosis occurs in which the pure solvent starts flowing out of the solution through the semi permeable membrane.


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