Question

What is the depression in freezing point of a solution of non-electrolyte if elevation in boiling point is `0.13K` ? `(k_(b)=0.52 mol^(-1) kg, k_(f)= 1.86 mol^(-1) kg)`

Answer 1

`DeltaT_(b)=0.13, k_(b)=0.52, DeltaT_(f)=?, k_(f)= 1.86`
For a given solution, `DeltaT_(b)propk_(b)`
`DeltaT_(f)propK_(f)`
`:. (DeltaT_(f))/(DeltaT_(b))=(K_(f))/(K_(b))`
or `DeltaT_(f)=DeltaT_(b)xx(K_(f))/(K_(b))=(0.13xx1.86)/(0.52)`
`DeltaT_(f)= 0.465K`