Problem: Yttrium(III) chloride dissolves in water according to: YCl3(s) → Y3+(aq) + 3 Cl-(aq). What is the boiling point of the solution when 0.1953 g of YCl3 (molar mass 195.3 g/mol) is dissolved in 10.0 g of H2O? (Kb of water is 0.512 °C/m.)

FREE Expert Solution

We’re being asked to list the given aqueous solutions in order of increasing boiling points.


Recall that the boiling point of a solution is higher than that of the pure solvent and the change in boiling point (ΔT­b) is given by:


ΔTb=Tb, solution-Tb, pure solvent


The change in boiling point is also related to the molality of the solution:


ΔTb=imKb


where: 

i = van’t Hoff factor

m = molality of the solution (in m or mol/kg)

Kb = boiling point elevation constant (in ˚C/m) of the solvent


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Problem Details

Yttrium(III) chloride dissolves in water according to: YCl3(s) → Y3+(aq) + 3 Cl-(aq). What is the boiling point of the solution when 0.1953 g of YCl3 (molar mass 195.3 g/mol) is dissolved in 10.0 g of H2O? (Kb of water is 0.512 °C/m.)