Answer : The colligative property employed to achieve this can be, Elevation in boiling point.
Explanation :
Elevation in boiling point : It is defined as the temperature or boiling point of a liquid (a solvent) will be higher when the another compound is added. This means that a solution must be at a higher temperature or boiling point than a pure solvent.
For example : When a non-volatile solute (a salt) is added to a pure solvent such as water.
The formula for elevation in boiling point will be,
[tex]\Delta T_b=k_b\times m[/tex]
or,
[tex]T_b-T^o_b=\frac{1000\times k_b\times w_2}{w_1\times M_2}[/tex]
where,
[tex]T_b[/tex] = boiling point of solution
[tex]T^o_b[/tex] = boiling point of pure solvent
[tex]k_b[/tex] = boiling point constant
m = molality
[tex]w_2[/tex] = mass of solute
[tex]w_1[/tex] = mass of solvent
[tex]M_2[/tex] = molar mass of solute
Hence, the colligative property employed to achieve this can be, Elevation in boiling point.
